I think that it's valid CF to include the auxiliary coordinates in the extended
grid_mapping format: `Temperature:grid_mapping = "Lambert_Conformal: lat lon x
y";`, as is done in the example below.
```
dimensions:
y = 228;
x = 306;
variables:
int Lambert_Conformal;
Lambert_Conformal:grid_mapping_name = "lambert_conformal_conic";
Lambert_Conformal:standard_parallel = 25.0;
Lambert_Conformal:longitude_of_central_meridian = 265.0;
Lambert_Conformal:latitude_of_projection_origin = 25.0;
double y(y);
y:standard_name = "projection_y_coordinate";
double x(x);
x:standard_name = "projection_x_coordinate";
double lat(y, x);
lat:standard_name = "latitude";
double lon(y, x);
lon:standard_name = "longitude";
float Temperature(y, x);
Temperature:units = "K";
Temperature:coordinates = "lat lon";
Temperature:grid_mapping = "Lambert_Conformal: lat lon x y";
```
I see now that my language was wrong when I talked about "ascertaining" the
order. I meant that any N-d auxiliary coordinate variables given by the
grid_mapping attribute are to be ignored when mapping the named variables to
the CRS-WKT axes.
However, I have checked back with your text, and see that you have written that
it is the order of the _coordinate variables_ that is used, so my point about
ignoring auxiliary coordinates is already catered for, so I'm happy. Sorry for
the diversion!
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