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Fig. 2. Skin colour values (A) and grey scale values (B) for frogs exposed to 20
and 30°C in both the dark and the light (Series I experiments) for at
least 1 h each. Values are means ± s.e.m. In A, light grey bars refer
to the average red value, dark grey values to the average green value, and
black bars to the average blue values. Both light level and temperature had
significant effects. *Significant difference from 20°C dark exposed frogs;
significant difference from 30°C dark exposed
frogs.