def _split_interaction_name_field(interactions):
    """take the interaction field "chr:start-stop,score"
    and return component parts as pandas Series
    """
    interactions = interactions.str.split(",", n=2, expand=True)
    chrom = interactions[0].str.split(":", n=2, expand=True)[0]
    start = interactions[0].str.split(
        ":", n=2, expand=True)[1].str.split("-", n=2, expand=True)[0]
    stop = interactions[0].str.split(
        ":", n=2, expand=True)[1].str.split("-", n=2, expand=True)[1]
    score = interactions[1]

    return chrom, start, stop, score