Effect of variation in mosaic. Best fit computational-observer thresholds for alternate mosaics (black circles in each panel) compared to the computational-observer thresholds for the trichromatic mosaic (colored circles in each panel, replotted from the black squares in Figure 6A). From left to right top row: LS cones only (no M, deuteranope), LM cones only (no S, tritanope), MS cones only (no L, protanope). From left to right bottom row: L cone only, M cone only, S cone only. Performance aggregation is over all stimulus patches, as we do not have fixation data corresponding to human observers with the alternate mosaics. The same noise factor (15.04) is used for all of the di- and monochromatic mosaic computational-observer thresholds shown here. This value is the average noise factor value obtained for the trichromatic computational-observer thresholds in 6A.