compute area covered by GALEX GUVcat, BCScat, SDSS, PanSTARRS, Gaia catalogs
Credit/Reference: Bianchi, L., de la Vega, A., Shiao, B., Souter, B. 2019, ApJS, 241, 14 (open access) DOI: 10.3847/1538-4365/aafee8
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