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Fig. 1. (A) Transmittance diagrams of the gelatine filters used as the artificial
landscape. (B) Sandhopper perceived radiance (SPR) expressed in arbitrary
units for the blue (b), green (g), yellow (y), orange (o), light grey (lg) and
medium grey (mg) gelatine filters. The filter pairs used in the experiments
are also indicated. See text for further explanation of sandhopper perceived
radiance.