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. Author manuscript; available in PMC: 2011 Feb 25.
Published in final edited form as: Vis Neurosci. 2008 May–Jun;25(3):507–516. doi: 10.1017/S0952523808080619

Fig. 1.

Fig. 1

Schematic representation of the red-green mixture field and the cone spectral responsivities, m(λ) and l(λ). The equations given form the basis of the Nagel model described in the text.