[fitsbits] nyphens in TTYPEn

[LC's No-Spam Newsreading account]

Are there (other than the recommendattion to use "only letters, digits,
and underscore" in 8.3.2. of the FITS standard) any rules or
recommendations which forbid or deprecate or discourage the use of an
hyphen or minus sign in the value of TTYPEn keywords of binary tables ?

A little script of mine is getting screwed up by a FITS file which
contains TTYPEn like O-INDEX or X-DEC, and (beside fmodhead'ing it) I'd
like to complain to the author of such file.

-- 
----------------------------------------------------------------------
nospam at mi.iasf.cnr.it is a newsreading account used by more persons to
avoid unwanted spam. Any mail returning to this address will be rejected.
Users can disclose their e-mail address in the article if they wish so.