Figure 2.
Mean spectral absorptance (a,d) and spectral distribution of cut-off wavelength (λcut) values (b,c,e,f) of oil droplets or diffuse spectral filters located in the inner segments of emu single (a–c) and double (d–f) cones. T, C, Y, R, and P, refer to T-, C-, Y-, R-, and P-type oil droplets located in UVS, SWS, MWS, LWS single cones and the principal members of LWS double cones, respectively, and A refers to the diffuse A-type oil droplet-like pigment located in the distal region of the inner segment of LWS double cone accessory members. D, dorsal retina (solid/dotted lines); V, ventral retina (dashed lines). Two distinct types of P-type oil droplet were present in the dorsal retina, which are identified by (arbitrary) subscripts 1 and 2.