from marvin.tools import Maps
maps = Maps('8485-1901')
ha = maps.emline_gflux_ha_6564

# Defaults:
# gray background (facecolor=''#A8A8A8'),
# white lines (edgecolor='w'),
# dense hatching: (hatch= 'xxxx')

# Custom: black background, cyan lines, less dense hatching
fig, ax = ha.plot(patch_kws={'facecolor': 'k',
                             'edgecolor': 'c',
                             'hatch': 'xx'})