These plots are for all processed coadds that have bkgnd_sigma > 0.7, 1.3 and 1.3 for J, H and K, respectively. Note that the plots do not include coadds that have bkgnd_sigma values lower than those values, which also imposes a coadd noise lower threshold as well. High background sigma values are dominantly observed in areas with high source densities, but also result from scans with severe airglow.
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The pink line is "coadd_noise = bkgnd_sigma".
http://spider.ipac.caltech.edu/staff/tchester/2mass/analysis/galaxies/backgrounds/sigma_plots.html
Comments and feedback: Tom Chester
Last update: 14 September 1998.