Attributes {
    IZ {
        Float32 pointwidth 1.0;
        Int32 gridtype 0;
        String units "unitless";
    }
    ISTA {
        Int32 gridtype 2;
        String units "ids";
    }
    3He {
        Float32 missing_value -9999.0;
        String long_name "tritium/helium age";
        String units "unitless";
    }
NC_GLOBAL {
    String Conventions "IRIDL";
}
}