Relative weightings of red and green cone inputs in the ganglion cell population. Results shown are from five different animals. Each data point represents the fraction of red cone input, *r*, for an individual ganglion cell. (*A*) Results from an R/Y hemizygote, three G/R heterozygotes, and a G/Y hemizygote. Blue error bars below the data points represent the spread of the data points (mean ± SD). Black error bars above the data points denote the experimental uncertainty (2 × SD of the noise) in each measurement, averaged over all cells in the experiment. *n*, number of ganglion cells. The skew of the R/Y data points from the expected value of 1.0 likely reflects a combination of uncertainties in the red pigment spectral sensitivity curve and the spectral output of the LCD panel. (*B*) Scatter plots of two independent measurements of *r*; “even” and “uneven” refer, respectively, to data obtained during the interleaved even and odd minutes of the recording session (see *Materials and Methods*). Each data point represents one cell. (*Left*) Three G/R retinas. (*Right*) G/Y and R/Y retinas. The dotted line represents identical values. In G/R retinas, the cell-to-cell variation in *r* exceeds the variation from measurement error.

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