modFreqs - Change background frequencies of reversible tree model in such

       Change background frequencies of reversible tree model in such a way that reversibility is maintained.

       modFreqs - Change background frequencies of reversible tree model in such

--help, -h

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modFreqs 1.4                                        May 2016                                         MODFREQS(1)

modFreqs tree.mod <Afreq> <Cfreq> <Gfreq> <Tfreq> > new.mod

              OR

       modFreqs tree.mod <G+Cfreq> > new.mod