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Small-angle X-ray and neutron scattering experiments are used in many fieldsof the life sciences and condensed matter research to obtain answers toquestions about the shape and size of nano-sized structures, typically in therange of 1 to 100 nm. It provides good statistics for large numbers ofstructural units for short measurement times. With the ever-increasing quantityand quality of data acquisition, the value of appropriate tools that are ableto extract valuable information is steadily increasing. SASfit has been one ofthe mature programs for small-angle scattering data analysis available for manyyears. We describe the basic data processing and analysis work-flow along withrecent developments in the SASfit program package (version 0.94.6). Theyinclude (i) advanced algorithms for reduction of oversampled data sets (ii)improved confidence assessment in the optimized model parameters and (iii) aflexible plug-in system for custom user-provided models. A scattering functionof a mass fractal model of branched polymers in solution is provided as anexample for implementing a plug-in. The new SASfit release is available formajor platforms such as Windows, Linux and Mac OS X. To facilitatedocumentation, it includes improved indexed user documentation as well as aweb-based wiki for peer collaboration and online videos for introduction ofbasic usage. The usage of SASfit is illustrated by interpretation of thesmall-angle X-ray scattering curves of monomodal gold nanoparticles (NISTreference material 8011) and bimodal silica nanoparticles (EU referencematerial ERM-FD-102).

SASfit: A comprehensive tool for small-angle scattering data analysis