JEB -- Ramsden et al. 211 (9): 1376 Figure IG1

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Fig. 1. Spectral energy distribution of the adapting backgrounds. The irradiance measurements are plotted as log irradiance (photons cm² s^–1). (A) Broad-spectrum tungsten halogen adapting background used in control and cobalt PS and spectral sensitivity experiments. (B) UVS cone mechanism, adapting background using a UG-11 filter in a tungsten halogen background channel. (C) LWS cone mechanism, adapting background using a 600LP cut-off filter.