sky_coverage_plot -o default.png: default
sky_coverage_plot -m "lon_0=180" -o Mollweide_180d.png: make a Mollweide projection centered at RA=180d
sky_coverage_plot --askaponly -o askaponly.png: Only plot the ASKAP surveys
sky_coverage_plot --projection=Albers -o galactic_center.png -m lon_0=270 lat_0=-27 lat_1=-47 lat_2=-7: make an Albers projection centered roughly on the Galactic Center
