Keywords: sic-gdfv2

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### Version 2.0: Historical Frequency implementation

This version is identified by `code_version_uvt_freq = code_version_uvt_v20 = 20`:

- u,v coordinates are "normal" lengths, as measured in the geocentric frame
- they correspond to the frequency given in the spectral axis
- the rest frequency is given separately
- the spectral resolution does not distinguish between geocentric and selected system frame (usually LSR): it is approximate.

In conclusion, v2.0 has lousy spectral axis definition and lousy angular resolution.