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the coordinate systems look ok to me. the lat and lon axis types dont
get recognized because they use degrees as units instead of
degrees_north and degrees_east, respectively, as CF requires. thats
why you will get a null in your code.
the grid display looks wrong, however, probably because X has "100 km"
units, and y has nothing, so km is assumed.
i think im wrong on assuming km - you must explicitly add the correct
units to projection coordinates.