Dataset {
    Float32 lat[lat = 3];
    Float32 lon[lon = 4];
    Grid {
      Array:
        Float64 P[time = 59][lat = 3][lon = 4];
      Maps:
        Int32 time[time = 59];
        Float32 lat[lat = 3];
        Float32 lon[lon = 4];
    } P;
    Grid {
      Array:
        Float64 T[time = 59][lat = 3][lon = 4];
      Maps:
        Int32 time[time = 59];
        Float32 lat[lat = 3];
        Float32 lon[lon = 4];
    } T;
    Int32 time[time = 59];
} aggExisting.ncml;