code: def pickAChannelList(self, ra_deg, dec_deg):
          
          try:
              from astropy.coordinates import SkyCoord
              from astropy import units as u
          except ImportError:
              raise ImportError("AstroPy needs to be installed to use this feature.")
          cRa = self.currentRaDec[:, 3]  # Ra of each channel corner
          cDec = self.currentRaDec[:, 4]  # dec of each channel corner
          catalog = SkyCoord(cRa*u.deg, cDec*u.deg)
          position = SkyCoord(ra_deg*u.deg, dec_deg*u.deg)
          idx, _, _ = position.match_to_catalog_sky(catalog)
          return self.currentRaDec[idx, 2]
docs: Similar to pickAChannel() but takes lists as input.
  
          This will require AstroPy to be installed.