Charlie Zender

Thank you for helping build NCO for OpenBSD. The missing data files are in the indicated locations in the source tree. I do not know why they appear as missing...

In case it is not clear, all the CDL files like `in.cdl` are intended for use in testing and verification of the executables. None are needed at run-time. If the...

Thanks for reporting this. Please point me to an EAMxx dataset that contains `horiz_winds`. The EAMxx files that I use for testing do not contain this variable.

I can reproduce the issue. The problem is that vertical interpolation expects the trailing dimensions to be horizontal then vertical, or vertical then horizontal: `lev,lat,lon` or `lat,lon,lev` or `ncol,lev` or...

OK, I can cause it to die with an informative error when the vertical interpolation encounters unknown dimensions like "dim2" mixed-in with the trailing spatial dimensions. This would be better...

`area` is treated as a "grid variable" and is not subtracted from itself, much like the variables `lat` and `lon`. NCO assumes that users want to know the difference between...

This behavior is documented [here](http://nco.sf.net/nco.html#prc_xcp). I surmise that `area` was added to this list of non-coordinate grid properties during the time-period you mention.