Figure 6.
Mid-wavelengths of the absorptance spectra (λmid) of the three oil droplet types (from figure 4; bold symbols and curves), together with the histogram of measured λmid-values (bars; from table 1 of [12]), and the corresponding spectral sensitivity peak wavelengths, λmax, resulting for the three cone photoreceptors, SWS, MWS and LWS (from figure 5; small symbols and thin curves). The three droplet types, C, Y and R, were assumed to contain the carotenoids galloxanthin, zeaxanthin and astaxanthin, respectively. Y+ represents an oil droplet containing zeaxanthin with a peak absorbance of 4.0 as well as astaxanthin in increasing amounts, with peak absorbance 0.5, 1.0, 1.5 and 2.0 (orange symbols). The bold symbols on the λmax-curves indicate the λmax-values resulting with the average oil droplet absorbances.