Illustrated for ILC2 on the SZ Challenge v1, the detection density (top panel) is compared to the pixel hit count for the map at 143 GHz (bottom panel). The noise in the simulated Planck maps scales as 1/. At high Galactic latitudes, the detection density clearly anticorrelates with map noise. Both maps are smoothed on a scale of 20 degrees, and the Galactic plane (|b| < 20 deg) is masked.