grf {
    grfid: "sn\00\00";
    name: string(STR_REGRESSION_NAME);
    desc: string(STR_REGRESSION_DESC);
    version: 0;
    min_compatible_version: 0;
}

snowline (linear) {
    day_of_year(2,  1):  2;
    day_of_year(11, 1):  4;
    177: 29;
    day_of_year(10, 1): 29;
}

