def samples_with_hetero_calls(data, hetero_c):
    """Gets male and heterozygous calls.

    Args:
        data (pandas.DataFrame): the probability matrix
        hetero_c (str): the name of the heterozygous column

    Returns:
        pandas.Index: samples where call is heterozygous

    """
    return data[data.idxmax(axis=1) == hetero_c].index
