For Triton TX-100, the fit analysis using geometrical core-shell models is much more challenging. Trial fits showed that standard segregated core-shell models are unable to properly describe the data. It is not possible to describe both the SAXS and SANS data simultaneously on an absolute scale for any physical set of parameters. The result of the best simultaneous SAXS/SANS fit with a distinct core-shell structure is shown as lines in Figure ). We attempted to further improve the fit quality by considering different density distribution internally of the micelles and even intermixing of head and tail segments without improving the results.