In Figure , we show the cylindrical distribution function (CDF) for the C12EO10 micelles. We also report the radial distribution functions (RDF) in Figure of the SI. The C12EO10 micelles show separation in the core and shell regions, with diffuse boundaries, and are nearly spherical. As is evident in the RDF, the overlap between the EO and the alkyl beads spans a region of approximately 10 Å. We use the moments of inertia to distinguish between different micellar shapes (see SI for details). About 15 % of the micelles have aspect ratio ϵ > 1.6, and 8 % have ϵ > 1.7, thus, showing some prolate feature. The mean values are between ϵ = 1.37 and 1.46, depending on the aggregation number, which is in very good agreement with the core-shell model ϵ = 1.4.