Fig. 6. Averaged spectral sensitivity curves (±s.d.) of polarization sensitive photoreceptors from different eye regions in Gonodactylus chiragra. Ventral hemisphere (VH; A) and dorsal hemisphere (DH; B) receptors have broad spectral sensitivity curves with two maxima and similar overall sensitivity. The spectral sensitivity curves of 2D receptors (C) and row 5 and 6 receptors (D), which are in this study grouped together as `high PS cells', have very similar, narrow sensitivity curves with a bandwidth of less than 100 nm, peaking at around 565 nm. Only the spectral sensitivities of stained cells were averaged in C and D in order to avoid the incorrect inclusion of a cell with different identity.