Velocity axis

The reference channel of the velocity axis was already changed. It only remains to recompute the new velocity resolution associated to the new rest frequency

  $\displaystyle \ensuremath{\delta \ensuremath{v_{\ensuremath{\mathrm{new}}}^{\en...
...}}{\ensuremath{f_\ensuremath{\mathrm{sig,new}}^{\ensuremath{\mathrm{rest}}}}}.
$ (53)