def get_dims(func_df):
    """Get constituent function parameter dimensions.

    Parameters
    ----------
    func_df : pandas.DataFrame
        Constituent function specifications.

    Returns
    -------
    list
        Constituent function parameter dimensions.

    """
    dimensions = []
    for _, row in func_df.iterrows():
        for par in ['DoseLevel', 'PercentVolume', 'Weight']:
            if isinstance(row[par], list):
                dimensions.append(row[par])
    return dimensions