> Is it the case that any variable which has all the compressed dimensions in
> the same order as the data variable must be compressed?
I now don't think that this needs to be proscribed, as we might want to share
auxiliary coordinates between compressed and non-compressed data variables,
e.g.
```
dimensions:
lat=73;
lon=96;
landpoint=2381;
depth=4;
variables:
int landpoint(landpoint);
landpoint:compress="lat lon";
float landsoilt(depth, landpoint);
landsoilt:long_name="soil temperature";
landsoilt:units="K";
landsoilt:coordinates="aux1";
float tas(lat, lon);
landsoilt:long_name="air temperature";
landsoilt:units="K";
landsoilt:coordinates="aux1";
float landsoilq(depth, lat, lon);
landsoilt:long_name="soil moisture";
landsoilt:units="1";
landsoilt:coordinates="aux1";
float depth(depth);
float lat(lat);
float lon(lon);
int aux1(landpoint);
```
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