def rdb_names(names):
    """ Return the usual .rdb format names. """
    r = []
    for name in names:
        # print(name)
        if name.lower() in ('rv', 'vrad', 'radvel'):
            r.append('vrad')
        elif name.lower() in ('rve', 'svrad', 'error', 'err', 'rverror'):
            r.append('svrad')
        elif name.lower() in ('fwhm'):
            r.append('fwhm')
        elif name.lower() in ('bis', 'bisspan', 'bis_span'):
            r.append('bis_span')
        elif name.lower() in ('contrast'):
            r.append('contrast')
        else:
            r.append(name)
    return r