For sources with ﹩\sigma _{m,n}> \sigma _{m,\mathrm{model}\,}﹩, we plot the standard deviation of photometric variability, ﹩\sigma _{\mathrm{var}\,,m,n}﹩, without false‐positive variables removed, shown as a function of apparent magnitude. We subtract the observed photometric scatter from the modeled measurement scatter in quadrature to arrive at a measure of the intrinsic source variability. Data points are shown in brown, with 15%, 35%, 65%, and 80% source density contours shown in black. See § 3.3.1 for discussion.