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[netcdfgroup] Allowed characters in variable names?

I'm converting some grib data to netcdf. For variable names, I use the shortNames defined in my grib-reader (grib_api), which in some cases start with numeric characters, e.g. '2t' or '10u'.
This works well with 3.6.2, but when run on another machine (ubuntu lucid, netcdf 3.6.3?), I get an error: 

NetCDF: Name contains illegal characters
I've seen that some of the variable-name code has been changed in 3.6.3 for UTF-8: http://www.unidata.ucar.edu/software/netcdf/docs/faq.html#fv22 but I haven't found out if the first character of a variable must be alphabetic (except in a very old user-guide at http://www.strw.leidenuniv.nl/~sfinx/netcdf9.html)
Are names like '2t' forbidden in netcdf, or is this a bug in 3.6.3, or is this a bug in my program, which just propagates to the netcdf error message? 



Best regards,

Heiko
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