# NOTE: MARS step is startStep. See GRIB-378
alias mars.step = startStep;

# class 3 is "er" which is 15 year re-analysis (ERA15)
# Only ERA15 has time and step
if(class != 3) {
    unalias mars.time;
    unalias mars.step;
}
alias mars.number=perturbationNumber;
