def METHOD_NAME(df):
    _df = df.copy()
    _df = format_header(_df, HEADER_B3_SCAL, "id_scal")
    # Keep only those rows whose values are not set
    if settings.create_empty_scalars.drop_default_scalars:
        _df = _df.loc[_df.loc[:, "var_value"].isna()]
    # Combine those parameters that are valid for all regions
    _df.loc[_df["var_name"].isin(NON_REGIONAL), ["name", "region"]] = [None, "ALL"]
    _df.drop_duplicates(inplace=True)
    _df = sort_values(_df)
    return _df