def get_quantmap(consfile):
    """Returns map of isobaric quant channel names as keys, channel numbers
    values from consensus XML.
    E.g. {'113': '0',
          '114': '1',}
    """
    quantmap = {}
    maplist = basereader.get_element(consfile, 'mapList')
    for mapitem in maplist:
        quantmap[mapitem.attrib['label']] = mapitem.attrib['id']
    return quantmap