
Photopic (black line) and scotopic1 (green line) luminosity functions. The photopic includes the CIE 1931 standard (solid),2 the Judd–Vos 1978 modified data (dashed),3 and the Sharpe, Stockman, Jagla & Jägle 2005 data (dotted).4 The horizontal axis is wavelength in nm.
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