Dear Irena, PS For the specific case of carbon nanotubes, the cylinders are of course very long and thin, so writing a model that performs the necessary numerical integrations reliably and accurately is non-trivial. Some other members of the sasview coding team have already had some thoughts in this direction . Richard Heenan (also at STFC ISIS Facility) From: users [mailto:users-bounces@lists.sasview.org] On Behalf Of stephen. king@stfc.ac.uk Sent: 19 March 2018 14:19 To: irenal@campus.technion.ac.il Cc: users@sasview.org Subject: Re: [SasView Users] Core + 2 shells cylinder model Dear Irena, As you have noticed, SasView does not have a multi-shell cylinder model. Bu t since you are now the third person in the last 6 months to have asked for such a model, maybe it is about time we provided one! I will ‘ticket’ t he requirement… In the meantime, the only fitting program I know with such a model is Olivi er Tache’s pySAXS. But it is not the most straightforward program to use. Kind regards, Steve King ISIS Facility (on behalf of the SasView development team) From: users [mailto:users-bounces@lists.sasview.org] On Behalf Of irenal@ca mpus.technion.ac.il Sent: 19 March 2018 11:56 To: users@sasview.org Subject: [SasView Users] Core + 2 shells cylinder model Hello, I'm a PhD student in the chemical engineering dept. at the Technion institu te of technology, Israel. I study carbon nanotubes dispersions stabilized with dispersants using SANS . I am looking for a model similar to the idea of "core_multi_shell" but for a cylinder instead of a sphere. I need a cylinder with a core and 2 concent ric shells, each shell has its own SLD. Are you familiar with such a model? I've looked in the search engine and in the marketplace but could not find such a model. Best, Irena Levin