Mean data from Table 1 of Hsia & Graham (1957).
The data are absolute thresholds for the detection of a centrally-fixated, 42-min diameter, 4-ms duration target. For details see Hsia & Graham (1957).
Hsia, Y., & Graham, C. H. (1957). Spectral luminosity curves for protanopic, deuteranopic, and normal subjects. Proceedings of the National Academy of Science U.S.A., 43, 1011-1019.