Fig. 4. Mean absorptance spectra (A) of oil droplets found in the single and double cone photoreceptors of the peafowl Pavo cristatus. T, C, Y, R, P and A refer to the T-type (`transparent'), C-type (`colourless'), Y-type (`yellow'), R-type (`red'), P-type (`principal/pale') and A-type (`accessory') oil droplets found in the VS, SWS, MWS and LWS single cones and the principal and accessory members of the double cone pair, respectively. Subscripts D and V refer to whether the P-type oil droplets were measured in the dorsal or ventral retina, respectively, as noticeable differences in the spectra obtained from these two retinal regions were observed. (B) The spectral distribution of the cut-off wavelengths (_cut) of the C-, Y-, R- and P-type oil droplets used to create the mean spectra. Note that P-type oil droplets measured in the ventral retina have a _cut at longer wavelengths than those measured in the dorsal retina.

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