def splitlabel(label, splitby=' ', ctrl='__'):
    """
    used for adding labels in plots.

    :param label: string
    :param splitby: string split the label by this character/string
    :param ctrl: string, marker that denotes a control condition  
    """
    splits = label.split(splitby)
    if len(splits) == 2:
        return splits
    elif len(splits) == 1:
        return splits + [ctrl]
