Well Known Text
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WKT Version 2

VERTCRS["IGN 1988 SM height",VDATUM["IGN 1988 SM",ID["EPSG",5214]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],GEOIDMODEL["RRAF 1991 to IGN 1988 SM height (1)",ID["EPSG",4564]],GEOIDMODEL["RGAF09 to IGN 1988 SM height (1)",ID["EPSG",5505]],GEOIDMODEL["RGAF09 to IGN 1988 SM height (2)",ID["EPSG",9188]],ID["EPSG",5620]]