Fig. 6: The refractive index of BSA determined via the Maxwell Garnett approximation.

Points correspond to the measurements of RI for BSA-water, and solid lines mark the Sellmeier fits (see the Supplementary Information, Table S4). The extraction was performed for three concentrations of BSA to show the repeatability of the result. The error bars are smaller than the marker size. The stars mark BSA RI values adopted from refs. ^{39,40,41,42,43,45}