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Fig. 4. Sighting distances (m) in all species as a function of wavelength (nm) and
depth (m). The sighting distance is color coded in the figures from long
distances as red to short distances as blue (see color bar). The following
viewing angles (from top to bottom) are displayed: from directly above
(180°), diagonally above (150°), horizontal (90°), diagonally
below (30°) and directly below (0°).