Fig. 2.

Optical characteristics of a Nolana paradoxa flower. a Two transmittance (T _ad) and reflectance (R _ad) spectra of the adaxial side of a corolla measured with an integrating sphere. b Transmittance (t _p) and reflectance (r _p) spectra of the pigmented layer calculated from the average of the measured transmittance (${\overline{T}}_{\text{ad}}$) and reflectance (${\overline{R}}_{\text{ad}}$) spectra, using three values for the scattering parameter of the unpigmented layer ($S_{\text{u}}^{\ast }$). c Absorption ($K_{\text{p}}^{\ast }$) and scattering ($S_{\text{p}}^{\ast }$) parameter for the pigmented layer calculated from the layer’s transmittance and reflectance spectra of b