def FillBetween(xs, y1, y2=None, where=None, **options):
 options = _UnderrideColor(options)
 options = _Underride(options, linewidth=0, alpha=0.5)
 pyplot.fill_between(xs, y1, y2, where, **options)

def FillBetween ( xs , y1 , y2 = None , where = None , ** options ) : options = _UnderrideColor ( options ) options = _Underride ( options , linewidth = 0 , alpha = 0.5 ) pyplot . fill_between ( xs , y1 , y2 , where , ** options )
plots a line .