code: def set_base_headers(self, hdr):
          
          hdr['NUMXVER'] = (__version__, 'Numina package version')
          hdr['NUMRNAM'] = (self.__class__.__name__, 'Numina recipe name')
          hdr['NUMRVER'] = (self.__version__, 'Numina recipe version')
          return hdr
docs: Set metadata in FITS headers.