1alias mars.origin = centre;
2alias mars.number = perturbationNumber;
3
4meta    forecastperiod    g1fcperiod(P1,P2,timeRangeIndicator,indicatorOfUnitOfTimeRange) : no_copy;
5alias   mars.fcperiod = forecastperiod;
6
7unalias mars.step;
8alias mars.method = methodNumber;
9if (class is "od") { alias mars.system = systemNumber; }
10