Fig. 2. (A) Spectral measurements of reflective changes in a living fish (data normalised). 1, 2 and 3 indicate the phases shown in Fig. 1B. (B) Ratio of reflectance half-width to the peak wavelength (/_max, where is the bandwidth at 50% reflectivity, and _max is the peak wavelength). Reflectance half-widths increase with wavelength (see Fig. 1C), but the ratio /_max changes very little. The regression line and equation are shown in red. Predicted reflectance half-widths shown in blue (after Land, 1972). (C) The effect of increasing the angle of incidence on the wavelengths reflected by the reflective stripes. With increasing angle of incidence, the reflected wavelengths shift towards the shorter (blue/UV) end of the spectrum (data normalised).