def areaBetween(requestContext, *seriesLists):
    if len(seriesLists) == 1:
        [seriesLists] = seriesLists
    assert len(seriesLists) == 2, ("areaBetween series argument must "
                                   "reference *exactly* 2 series")
    lower, upper = seriesLists
    if len(lower) == 1:
        [lower] = lower
    if len(upper) == 1:
        [upper] = upper
    lower.options['stacked'] = True
    lower.options['invisible'] = True

    upper.options['stacked'] = True
    lower.name = upper.name = "areaBetween(%s)" % upper.pathExpression
    return [lower, upper]
Draws the vertical area in between the two series in seriesList. Useful for
dataset/ETHPy150Open brutasse/graphite-api/graphite_api/functions.py/areaBetween