Simplified human cone response curves, based on Dicklyon's PNG version, itself based on data from Stockman, MacLeod & Johnson (1993) Journal of the Optical Society of America A, 10, 2491-2521d (log E human cone response, via http://www.cvrl.org/database/text/cones/smj2.htm)
Click on a date/time to view the file as it appeared at that time.
The following pages on the English Wikipedia link to this file (pages on other projects are not listed):