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/usr/share/eccodes/definitions/mars/grib.espd.an.def is in libeccodes-data 2.6.0-2.

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# assert(localDefinitionNumber == 1);
alias mars.date   = dataDate;
alias mars.time   = dataTime;

if (class is "od") { alias mars.origin = centre; }
if (class is "e2") { alias mars.origin = centre; }
if (class is "em") { alias mars.origin = centre; }

# We need this because 'jDirectionIncrementInDegrees,iDirectionIncrementInDegrees,' is defined later
meta marsGrid sprintf("%g/%g",iDirectionIncrementInDegrees,jDirectionIncrementInDegrees) : dump;
alias mars.grid = marsGrid;
alias mars.number=perturbationNumber;