# NOTE: verificationDate based on startStep

meta  verificationDate   g1verificationdate(dataDate, dataTime, startStep) : read_only;
alias mars.date        = verificationDate;
alias mars.step        = endStep;

# Only ERA15 has time and step 
if(class != 3) { 
	unalias mars.time; 
	unalias mars.step; 
}
alias mars.instrument = instrumentType;
alias mars.ident = satelliteNumber;

alias mars.number = perturbationNumber;