def band2rcumode(band):
    """Map band to rcumode string (Inverse of rcumode2band())"""
    if band == "10_90":
        rcumode = "3"
    elif band == "30_90":
        rcumode = "4"
    elif band == "110_190":
        rcumode = "5"
    elif band == "170_230":
        rcumode = "6"
    elif band == "210_250":
        rcumode = "7"
    else:
        raise ValueError('Undefined band %{}'.format(band))
    return rcumode