fixed wavelength -> velocity conversion
fixed wavelength -> velocity conversion

jpinedaf/pyspeckit,pyspeckit/pyspeckit,mikelum/pyspeckit,pyspeckit/pyspeckit,mikelum/pyspeckit,keflavich/pyspeckit-obsolete,e-koch/pyspeckit,low-sky/pyspeckit,dinossimpson/pyspeckit,keflavich/pyspeckit,bsipocz/pyspeckit,vlas-sokolov/pyspeckit,bsipocz/pyspeckit,e-koch/pyspeckit,dinossimpson/pyspeckit,allisony/pyspeckit,jpinedaf/pyspeckit,low-sky/pyspeckit,keflavich/pyspeckit,vlas-sokolov/pyspeckit,allisony/pyspeckit