Attributes {
    gid {
        Int32 gridtype 0;
        String units "unitless";
    }
    dist_main {
        String PGtype "float8";
        Float32 missing_value NaN;
        String long_name "dist_main";
        String units "unitless";
    }
NC_GLOBAL {
    String Conventions "IRIDL";
}
}