- users - SasView Mailing Lists

SASVIEW SLD profiles
by Garvey, Christopher via users 21 Jul '21

21 Jul '21

Hi All, Some of the models can output nice SLD profiles of the model as a graphic. I’ve had a look if it’s possible to easily export this profile as a text file (distance vs SLD) but not yet. If someone else has looked at this problem, and perhaps even solved it, I’d be pleased to hear about it. Thanks for your consideration. Regards Chris

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Re-opening the fitting parameters on sasview
by Daniel Alexander Støvring Laima via users 23 Apr '21

23 Apr '21

Hi How do you re-open the fan with all the fitting parameters? I had fitted some data but then I had by accident closed the 'fit panel' fan before screen dumping them and now I can't find them again? Kindly Daniel

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News and a New Release (5.0.4)
by Stephen King - STFC UKRI via users 12 Apr '21

12 Apr '21

Dear Members of the SasView User List, We hope you are safe and well during these unusual times. GENERAL NEWS It is seven months since our last bulletin and in that time the Development Team has been working hard to bring SasView 5 to feature-parity with SasView 4. We are still not quite there, but some very good progress has been made as our latest release (see below) hopefully demonstrates. In the intervening months we have also held two virtual 'Hackathons'. The first, in October, saw the Development Team focus on writing a paper about SasView; something that has been on our to-do list for quite some time and which many of you have asked for ('Is there a reference for SasView?')! We now have a first draft, but it still needs some more work before we can send it off for publication. The second Hackathon, in January, focussed on usability issues in SasView and we believe that the new release has benefitted as a result. We also thought we would highlight what we see as a great contribution by some of YOU, the SasView user base. Since we released SasView 5 in May 2019, an astounding 24 new models have been added to the Model Marketplace. If you cannot find a model you need in the distributed model library, do remember to check the Marketplace. NEW RELEASE The Development Team is pleased to announce the release of SasView 5.0.4, available for download as usual through the website at www.sasview.org<http://www.sasview.org>. This release fixes several issues: - A bug that had been around since 4.2.2 and which prevented Batch Fitting from using any dI values in the data file has finally been fixed. The consequence of this bug was that Single Fits and Batch Fits on the same datasets could return different parameters. Now, where present, dI values will always be used by default in both cases. - The bug introduced in 5.0.3 which prevented the plotting of Batch Fit results has also been fixed. - An issue with the behaviour of the 1D pinhole resolution smearing routine in cases of large divergence has also been addressed. - There are a number of improvements to plotting and plot management. - Several usability issues in the P(r) Inversion and Invariant Analysis perspectives have been addressed. Improvements have also been made to the functioning of Project Save/Load. There are also some new features in SasView 5.0.4: - Though not strictly a new feature, the functionality and operation of parameter constraints has been significantly overhauled for this version. This was the excellent work of ILL intern, Nicholas Martinez, to whom we offer our grateful thanks. Nicolas has since moved on to a new position. - The slicer functionality has been significantly overhauled and made to work properly. - The slider bars on plots for selecting the q-range for fitting that featured in earlier versions of SasView have been re-introduced by popular request, although they do not yet work on linearized plots. - It is now possible to swap the dataset used to create an existing FitPage for a different dataset. This removes the need to re-generate a complex model (eg, featuring many parameters and/or constraints) many times over to use it to fit several datasets. - It is now also possible to assign custom names to loaded datasets, rather than just identifying the data by its filename. Right-click on a dataset in the Data Explorer to activate. Of course, as always, there remain many things that could be added, improved or, sadly, that need fixing. So please continue to provide feedback, bug reports (issues), and, when possible, fixes, either to the code or the documentation or tutorials, as GitHub pull requests, for those who can, or by simply emailing help(a)sasview.org<mailto:help@sasview.org>. FUTURE PLANS As we said last Autumn, it is our intention, as and when the pandemic allows, to engage the community more fully in the development process writ large, including the creation of tutorials, YouTube videos, documentation, and instructional materials, as well as code development. If any of you have thoughts on how to achieve these goals, or are simply interested in contributing in any capacity but aren't sure how, please feel free to email us on the help list. Thank you for your continued support! The SasView Development Team This email and any attachments are intended solely for the use of the named recipients. If you are not the intended recipient you must not use, disclose, copy or distribute this email or any of its attachments and should notify the sender immediately and delete this email from your system. UK Research and Innovation (UKRI) has taken every reasonable precaution to minimise risk of this email or any attachments containing viruses or malware but the recipient should carry out its own virus and malware checks before opening the attachments. UKRI does not accept any liability for any losses or damages which the recipient may sustain due to presence of any viruses. Opinions, conclusions or other information in this message and attachments that are not related directly to UKRI business are solely those of the author and do not represent the views of UKRI.

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Re: [SasView Users] SasView-5.0.2 and 4.2.2 Own Model on MaxOS
by Stephen King - UKRI STFC via users 28 May '20

28 May '20

Thanks. We'll take a look. From: Sebastian Lages <lages(a)chalmers.se> Sent: 28 May 2020 14:01 To: King, Stephen (STFC,RAL,ISIS) <stephen.king(a)stfc.ac.uk>; users(a)sasview.org Cc: Beatrice Swensson <beatrice.swensson(a)chalmers.se> Subject: Re: SasView-5.0.2 and 4.2.2 Own Model on MaxOS Dear Stephen, this is a quick reply! Thanks a lot! I feel obliged to return the favour of a quick answer and here it is. Please find the source code attached in a zip-file. Best regards from Sweden, Sebastian Materials Physics Department of Physics Chalmers University of Technology SE-412 96 Göteborg Sweden Homepage Liebi Group<https://www.chalmers.se/en/departments/physics/research/cmp/research/Liebi_…> ________________________________ From: Stephen King - UKRI STFC <stephen.king(a)stfc.ac.uk<mailto:stephen.king@stfc.ac.uk>> Sent: Thursday, May 28, 2020 2:56:03 PM To: Sebastian Lages; users(a)sasview.org<mailto:users@sasview.org> Cc: Beatrice Swensson Subject: RE: SasView-5.0.2 and 4.2.2 Own Model on MaxOS Dear Sebastian, Beatrice, Thank you for contacting us. Please could you resend the two attachments in a zip file. Mail clients are blocking plain source code attachments these days for security reasons. Thank you. Kind regards, Steve King On behalf of the Developers From: Sebastian Lages <lages(a)chalmers.se<mailto:lages@chalmers.se>> Sent: 28 May 2020 13:37 To: users(a)sasview.org<mailto:users@sasview.org> Cc: Beatrice Swensson <beatrice.swensson(a)chalmers.se<mailto:beatrice.swensson@chalmers.se>> Subject: SasView-5.0.2 and 4.2.2 Own Model on MaxOS Dear SasViewers, we wrote our own model, see attached files. It's based on in-build models and runs perfectly fine on my LinuxMint 18. The files live in "/home/sebastian/SasView/sasmodels/models/". Just like it said in the description for writing own models. However, on MacOS we cannot make it work. Not with SasView-4.2.2, not with SasView-5.0.2. Every time we choose the model from the FitPage's drop down menu, we get an error message. And there's more. The model "flexible_cylinder" stopped working as well. It stopped completely. Interestingly with the same error message we got for our own model. Only a fresh installation of SasView is able to correct this behaviour, restarting the software is not enough. How can we correct this? Best regards, Sebastian Materials Physics Department of Physics Chalmers University of Technology SE-412 96 Göteborg Sweden Homepage Liebi Group<https://www.chalmers.se/en/departments/physics/research/cmp/research/Liebi_…> This email and any attachments are intended solely for the use of the named recipients. If you are not the intended recipient you must not use, disclose, copy or distribute this email or any of its attachments and should notify the sender immediately and delete this email from your system. UK Research and Innovation (UKRI) has taken every reasonable precaution to minimise risk of this email or any attachments containing viruses or malware but the recipient should carry out its own virus and malware checks before opening the attachments. UKRI does not accept any liability for any losses or damages which the recipient may sustain due to presence of any viruses. Opinions, conclusions or other information in this message and attachments that are not related directly to UKRI business are solely those of the author and do not represent the views of UKRI.

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Re: [SasView Users] SasView-5.0.2 and 4.2.2 Own Model on MaxOS
by Stephen King - UKRI STFC via users 28 May '20

28 May '20

Dear Sebastian, Beatrice, Thank you for contacting us. Please could you resend the two attachments in a zip file. Mail clients are blocking plain source code attachments these days for security reasons. Thank you. Kind regards, Steve King On behalf of the Developers From: Sebastian Lages <lages(a)chalmers.se> Sent: 28 May 2020 13:37 To: users(a)sasview.org Cc: Beatrice Swensson <beatrice.swensson(a)chalmers.se> Subject: SasView-5.0.2 and 4.2.2 Own Model on MaxOS Dear SasViewers, we wrote our own model, see attached files. It's based on in-build models and runs perfectly fine on my LinuxMint 18. The files live in "/home/sebastian/SasView/sasmodels/models/". Just like it said in the description for writing own models. However, on MacOS we cannot make it work. Not with SasView-4.2.2, not with SasView-5.0.2. Every time we choose the model from the FitPage's drop down menu, we get an error message. And there's more. The model "flexible_cylinder" stopped working as well. It stopped completely. Interestingly with the same error message we got for our own model. Only a fresh installation of SasView is able to correct this behaviour, restarting the software is not enough. How can we correct this? Best regards, Sebastian Materials Physics Department of Physics Chalmers University of Technology SE-412 96 Göteborg Sweden Homepage Liebi Group<https://www.chalmers.se/en/departments/physics/research/cmp/research/Liebi_…> This email and any attachments are intended solely for the use of the named recipients. If you are not the intended recipient you must not use, disclose, copy or distribute this email or any of its attachments and should notify the sender immediately and delete this email from your system. UK Research and Innovation (UKRI) has taken every reasonable precaution to minimise risk of this email or any attachments containing viruses or malware but the recipient should carry out its own virus and malware checks before opening the attachments. UKRI does not accept any liability for any losses or damages which the recipient may sustain due to presence of any viruses. Opinions, conclusions or other information in this message and attachments that are not related directly to UKRI business are solely those of the author and do not represent the views of UKRI.

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Treatment of Self-Assembled Structures
by Grayson Johnson via users 08 May '20

08 May '20

Dear Users Forum, I’m new to the process of fitting SAXS data, and I am looking for guidance on what assumptions to make for my models. I have a set of small, probably spherical particles that assemble into micron length rectangular prism shaped structures. I have a known crystal structure from TEM images. Is it better to model the SAXS profile as a parallelepiped (and presumably miss out on the structure factor information that is present) or as spheres? If I do as spheres, is there a good way to use the crystal structure information to help the model along? When I perform a fit with spheres, I don’t seem to get the really low q behavior that I get with the parallelepiped. When I fit with the parallelepiped, the fit takes upwards of 30 minutes, and I haven’t quite been able to dial in on the parameters. The assemblies have a lot of variation in length, but not too much in width and height. Thanks for any help that you can provide, Grayson Johnson

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FW: theLightStuff online lecture series, lecture #3: Friday 17th, 15:30 UTC
by Stephen King - UKRI STFC via users 16 Apr '20

16 Apr '20

Dear colleagues and fellow scatterers, To help break the isolation between researchers stuck at home in these pandemic times, we have set up an international online short lecture series on scattering and diffraction. The lectures normally take place on Fridays via a Zoom webinar. Details on the current schedule are here: https://www.bam.de/thelightstuff With this lecture series we hope to highlight early-career researchers (ECRs) and their projects, with talks aimed at Ph.D. students, post-docs and other ECRs. With permission of the speakers, the talks are recorded and put online as well, to broaden the access to the talks. The first two of these talks have now appeared online: https://www.youtube.com/channel/UCrFK5hLLcuDcbKmWeuJvpTw The upcoming lecture is that of Dr. Lilo Pozzo talking about time-resolved neutron scattering to elucidate molecular transport mechanisms in oil emulsions. Details on this lecture, and how to join are here: https://www.bam.de/Content/EN/Events/2020/2020-04-17-the-light-stuff-online… See you there on Friday the 17th! Yours sincerely Brian R. Pauw — If you have received this email outside of working hours please be assured that there is no expectation that you will reply to it outside of your normal working pattern. Bundesanstalt für Materialforschung und -prüfung (BAM) Division 6.5 - Synthesis and Scattering of Nanostructured Materials Unter den Eichen 87 12205 Berlin Germany T: + 49 30 8104-3361 F: + 49 30 8104-1617 brian.pauw(a)bam.de<mailto:brian.pauw@bam.de><mailto:brian.pauw@bam.de> www.bam.de<http://www.bam.de> __________________________________________________ Die BAM ist eine Bundesoberbehörde im Geschäftsbereich des Bundesministeriums für Wirtschaft und Energie.

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Sum Multi Function Version 4.2.2
by Abitaev, Karina via users 07 Apr '20

07 Apr '20

Dear Sasview Team, I am using Sasview 4.2.2 to fit a colloidal crystal of polymer nanoparticles. Here I use a Form factor for spheres, where a polydispersity is included. Furthermore, I am using a hard sphere structure factor. I found the option to multiply the Spheres with hard spheres, so I can supply for each a radius and polydispersity. In this context I was wondering how the structure factor and form factor are combined (decoupling approximation, local monodisperse approx, ...) Thank you in advance for your help! Best wishes, Karina -- Karina Abitaev Institut für Physikalische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany karina.abitaev(a)ipc.uni-stuttgart.de Phone: +49 (0)711/685-64502 Fax: +49 (0)711/685-64443

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Re: [SasView Users] [SasView Help] Error Message when loading 2D data
by Stephen King - UKRI STFC via users 13 Jun '19

13 Jun '19

BSL is just another format. It will output whatever data you give it: raw or reduced. Indeed, it was originally designed as a memory efficient way of storing early 2D SAXS detector data. The SasView File Converter merely converts the data in whatever format it is given and translates – that would be a better word, rather than convert – the input format to NXcanSAS (if the input is 2D). The metadata fields in the Converter are merely for annotation (since BSL saved memory by omitting such information!) and optional. So as Paul notes, Kuo-Chih, you should properly reduce your raw data into Q-space before exporting the 2D. SasView cannot help you with that. If your Bruker software does not do this (though I would hope it did!) you could try looking at some of the data reduction programs in use at synchrotrons. Kind regards, Steve King From: users <users-bounces(a)lists.sasview.org> On Behalf Of Stephen King - UKRI STFC via users Sent: 13 June 2019 09:44 To: users(a)sasview.org Subject: [SasView Users] FW: users post from kuo-chih.shih(a)uconn.edu requires approval From: users <mailman-bounces(a)lists.sasview.org> On Behalf Of Paul Butler Sent: 13 June 2019 00:58 To: users-owner(a)lists.sasview.org; Shih, Kuo-Chih <kuo-chih.shih(a)uconn.edu> Subject: Re: users post from kuo-chih.shih(a)uconn.edu requires approval Excellent! We are part way there ... Sadly it looks like the data is in pixel space rather than Q space (but SasView thinks it is in Q space which is what the NXcanSAS is presumably reporting). As an analysis tool SasView is designed to work in Q space. I am a bit surprised that it converted this way without warning. I guess the BSL output is in pixel space? I will have to think to see if I can come up with a clever solution. We need to wait for someone more familiar with the converter and NXcanSAS reader/writer to see if there is something that can be done at that end. However ... I note that the converter allows you to manually add detector, source, and sample metadata. Assuming you raw data is in fact in pixel space if you fill out those boxed in the converter should do the trick I'm thinking. Have a go and let us know. Paul ---------- Forwarded message ---------- From: "Shih, Kuo-Chih" <kuo-chih.shih(a)uconn.edu<mailto:kuo-chih.shih@uconn.edu>> To: Paul Butler <butlerpd(a)udel.edu<mailto:butlerpd@udel.edu>> Cc: "users(a)sasview.org<mailto:users@sasview.org>" <users(a)sasview.org<mailto:users@sasview.org>>, "help(a)sasview.org<mailto:help@sasview.org>" <help(a)sasview.org<mailto:help@sasview.org>>, "Nieh, Mu-Ping" <mu-ping.nieh(a)uconn.edu<mailto:mu-ping.nieh@uconn.edu>> Bcc: Date: Wed, 12 Jun 2019 23:26:28 +0000 Subject: RE: [SasView Help] Error Message when loading 2D data Dear Paul, Thanks a lot for the information. Yes, you are right. I am able to use Fit2D to export BSL/OTOKO 2D and that file can be directly import into SASView. I will also ask Bruker people whether there is a way for us to output our 2D pattern in the NeXUS NXcanSAS format. Just another question, after I input the 2D pattern, I would like to do a sector average. Is there any way that we can define the beam center manually? The beam center is off as shown in the attached file. Thanks again!! Best regards, Kuo-Chih From: Paul Butler<mailto:butlerpd@udel.edu> Sent: Wednesday, June 12, 2019 6:46 PM To: Shih, Kuo-Chih<mailto:kuo-chih.shih@uconn.edu> Cc: users(a)sasview.org<mailto:users@sasview.org>; help(a)sasview.org<mailto:help@sasview.org>; Nieh, Mu-Ping<mailto:mu-ping.nieh@uconn.edu> Subject: Re: [SasView Help] Error Message when loading 2D data Hi Kuo-Chih, 2D data formats are very specific (unlike 1D which most people default to the same general format). now that the NeXUS NXcanSAS standard reduced data format has been approved, we are trying to encourage its use to avoid exactly this kind of problem. Bruker poeple have attended some of the canSAS meetings where the standard work was discussed and now that it has been approved I encourage you to ask them to output their data in said format. In the meantime, for legacy reasons only, SasView also supports the NIST 2D ASCII format. Further, as you discovered, SasView has a converter which will convert ISIS 2D ASCII format as well as the BSL/OTOKO 2D format. Question: What type of ASCII format are you getting from Fit2D? My guess is that the error is because the format is not a supported input format to the converter? I am assuming this error is being thrown when you try to convert the data? I am well aware of Fit2D but have never used it so not sure what 2D output formats it supports, but looking online I'm not sure that its two ASCII 2D outputs (Spread sheet and MCA) are compatible? It seems like Fit2D will output a BSL 2D? which the SasView converter should be able to handle. It also seems to output a TIFF. If all else fails you can try that and use the image converter to see if it works? There maybe others who know more about the Fit2D output who might have some suggestions. Otherwise please let us know how you get on and if I have misunderstood the problem please don't hesitate to ask again. Cheers Paul . On Wed, Jun 12, 2019 at 4:24 PM Shih, Kuo-Chih via help <help(a)lists.sasview.org<mailto:help@lists.sasview.org>> wrote: Dear SASView Help Team, I am Kuo-Chih Shih from the University of Connecticut. Dr. Mu-Ping Nieh and I are now trying to fit the 2D scattering pattern we got from the Bruker nanostar machine. Since SASView is not able to read the raw data (.gfrm) from Bruker machine, I used Fit2D to convert it to a ASCII data. However, when I try to load the file, SASView shows me the following message. I also try to convert the ASCII file to the NXcanSAS file but it gave me another error message. I also attached the SasView log file. Could you please help me to troubleshoot this? _______________________________________________ help mailing list help(a)lists.sasview.org<mailto:help@lists.sasview.org> http://lists.sasview.org/cgi-bin/mailman/listinfo/help<https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.sasv…>

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FW: users post from kuo-chih.shih@uconn.edu requires approval
by Stephen King - UKRI STFC via users 13 Jun '19

13 Jun '19

From: users <mailman-bounces(a)lists.sasview.org> On Behalf Of Paul Butler Sent: 13 June 2019 00:58 To: users-owner(a)lists.sasview.org; Shih, Kuo-Chih <kuo-chih.shih(a)uconn.edu> Subject: Re: users post from kuo-chih.shih(a)uconn.edu requires approval Excellent! We are part way there ... Sadly it looks like the data is in pixel space rather than Q space (but SasView thinks it is in Q space which is what the NXcanSAS is presumably reporting). As an analysis tool SasView is designed to work in Q space. I am a bit surprised that it converted this way without warning. I guess the BSL output is in pixel space? I will have to think to see if I can come up with a clever solution. We need to wait for someone more familiar with the converter and NXcanSAS reader/writer to see if there is something that can be done at that end. However ... I note that the converter allows you to manually add detector, source, and sample metadata. Assuming you raw data is in fact in pixel space if you fill out those boxed in the converter should do the trick I'm thinking. Have a go and let us know. Paul ---------- Forwarded message ---------- From: "Shih, Kuo-Chih" <kuo-chih.shih(a)uconn.edu<mailto:kuo-chih.shih@uconn.edu>> To: Paul Butler <butlerpd(a)udel.edu<mailto:butlerpd@udel.edu>> Cc: "users(a)sasview.org<mailto:users@sasview.org>" <users(a)sasview.org<mailto:users@sasview.org>>, "help(a)sasview.org<mailto:help@sasview.org>" <help(a)sasview.org<mailto:help@sasview.org>>, "Nieh, Mu-Ping" <mu-ping.nieh(a)uconn.edu<mailto:mu-ping.nieh@uconn.edu>> Bcc: Date: Wed, 12 Jun 2019 23:26:28 +0000 Subject: RE: [SasView Help] Error Message when loading 2D data Dear Paul, Thanks a lot for the information. Yes, you are right. I am able to use Fit2D to export BSL/OTOKO 2D and that file can be directly import into SASView. I will also ask Bruker people whether there is a way for us to output our 2D pattern in the NeXUS NXcanSAS format. Just another question, after I input the 2D pattern, I would like to do a sector average. Is there any way that we can define the beam center manually? The beam center is off as shown in the attached file. Thanks again!! Best regards, Kuo-Chih [cid:16b4e157fd6f456b1e53] From: Paul Butler<mailto:butlerpd@udel.edu> Sent: Wednesday, June 12, 2019 6:46 PM To: Shih, Kuo-Chih<mailto:kuo-chih.shih@uconn.edu> Cc: users(a)sasview.org<mailto:users@sasview.org>; help(a)sasview.org<mailto:help@sasview.org>; Nieh, Mu-Ping<mailto:mu-ping.nieh@uconn.edu> Subject: Re: [SasView Help] Error Message when loading 2D data Hi Kuo-Chih, 2D data formats are very specific (unlike 1D which most people default to the same general format). now that the NeXUS NXcanSAS standard reduced data format has been approved, we are trying to encourage its use to avoid exactly this kind of problem. Bruker poeple have attended some of the canSAS meetings where the standard work was discussed and now that it has been approved I encourage you to ask them to output their data in said format. In the meantime, for legacy reasons only, SasView also supports the NIST 2D ASCII format. Further, as you discovered, SasView has a converter which will convert ISIS 2D ASCII format as well as the BSL/OTOKO 2D format. Question: What type of ASCII format are you getting from Fit2D? My guess is that the error is because the format is not a supported input format to the converter? I am assuming this error is being thrown when you try to convert the data? I am well aware of Fit2D but have never used it so not sure what 2D output formats it supports, but looking online I'm not sure that its two ASCII 2D outputs (Spread sheet and MCA) are compatible? It seems like Fit2D will output a BSL 2D? which the SasView converter should be able to handle. It also seems to output a TIFF. If all else fails you can try that and use the image converter to see if it works? There maybe others who know more about the Fit2D output who might have some suggestions. Otherwise please let us know how you get on and if I have misunderstood the problem please don't hesitate to ask again. Cheers Paul . On Wed, Jun 12, 2019 at 4:24 PM Shih, Kuo-Chih via help <help(a)lists.sasview.org<mailto:help@lists.sasview.org>> wrote: Dear SASView Help Team, I am Kuo-Chih Shih from the University of Connecticut. Dr. Mu-Ping Nieh and I are now trying to fit the 2D scattering pattern we got from the Bruker nanostar machine. Since SASView is not able to read the raw data (.gfrm) from Bruker machine, I used Fit2D to convert it to a ASCII data. However, when I try to load the file, SASView shows me the following message. I also try to convert the ASCII file to the NXcanSAS file but it gave me another error message. I also attached the SasView log file. Could you please help me to troubleshoot this? [cid:16b4dbb1d9ff456b1e51] [cid:16b4dbb1d9ff456b1e52] _______________________________________________ help mailing list help(a)lists.sasview.org<mailto:help@lists.sasview.org> http://lists.sasview.org/cgi-bin/mailman/listinfo/help<https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.sasv…> ---------- Forwarded message ---------- From: users-request(a)lists.sasview.org<mailto:users-request@lists.sasview.org> To: Cc: Bcc: Date: Wed, 12 Jun 2019 19:26:30 -0400 Subject: confirm 9bfe20656d2f9d2764c7afedd96df15915ab4eb9 If you reply to this message, keeping the Subject: header intact, Mailman will discard the held message. Do this if the message is spam. If you reply to this message and include an Approved: header with the list password in it, the message will be approved for posting to the list. The Approved: header can also appear in the first line of the body of the reply.

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