Hi Jim, Thank you for the reply. In your first sentence you refer to a "dimension coordinate variable" ... I can't find that exact phrase in the CF conventions document. So, I assume that you refer to a one-dimensional "coordinate variable" for which dimension name and variable name are equal such as ``` float x(x) ; x:standard_name = "projection_x_coordinate" x:axis = "X" ``` However, I don't have a one-dimensional coordinate variable. My `projection_x_coordinate` is still a two-dimensional array, so an auxiliary coordinate variable in CF terms. For example, ``` float x(m,n) ; x:standard_name = "projection_x_coordinate" x:axis = "X" ``` Do I understand it corretly that in this case the `sea_water_x_velocity` is pointing in the `projection_x_coordinate` direction? Is it necessary (or merely recommended) to add the `axis` attribute?
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