from ligo.skymap.tool.ligo_skymap_plot_airmass import main
from astropy.utils.data import download_file
filename = download_file('https://dcc.ligo.org/public/0146/G1701985/001/bayestar.fits.gz', cache=True)
main([filename, '--site', 'Las Campanas Observatory', '--time', '2017-08-17'])