code: def wcs(self):
          
          wcs = WCS(naxis=2)
          wcs.wcs.crval = self.config['crval']
          wcs.wcs.crpix = self.config['crpix']
          wcs.wcs.cdelt = self.config['cdelt']
          wcs.wcs.ctype = self.config['ctype']
  
          return wcs
docs: World coordinate system (`~astropy.wcs.WCS`).