def get_assoc_scheme_parameter(assoc_scheme):
    """
        assoc_scheme - 3B, 3C, etc.
        Output:
        param - Thermopack parameter
    """
    if assoc_scheme.upper() == "NONE":
        param = "no_assoc"
    else:
        param = "assoc_scheme_{}".format(assoc_scheme)
    return param