Dear Martin As I remarked above, the same variable in a file could serve as a data variable or an auxililary coordinate variable. In fact any variable in the file might be regarded as a data variable by the user of the file. Hassell et al. (2017) discuss this point. Hence we cannot define particular variables as being data variables. It's not an exclusive status. I agree that we ought to say what we mean by it, though. Is it in the NUG? I don't recall that we deliberately invented it in writing CF. Jonathan
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