Figure 5.

Standard deviation of the Focus arrays, arrays 01 to 09. Standard deviations are calculated from the individual probe sets of nine samples. The solid curve represents the standard deviation function derived from the consecutive sampling. The regression curve corresponding to logarithm of the linear standard deviation function fitted to logarithm of the experimental standard deviation (not shown) overlaps the consecutive sampling approximation; the coefficients obtained from consecutive sampling are a₁ = 2.92√2 and a₂ = 0.153√2 and the regression coefficients obtained from individual probe sets are a₁ = 2.87 and a₂ = 0.154 (data Modlich, Focus 1).