code: def luminosities_of_galaxies_within_ellipses_in_units(self, major_axis : dim.Length, unit_luminosity='eps',
                                                            exposure_time=None):
          
          return list(map(lambda galaxy: galaxy.luminosity_within_ellipse_in_units(
              major_axis=major_axis, unit_luminosity=unit_luminosity, kpc_per_arcsec=self.kpc_per_arcsec,
              exposure_time=exposure_time),
                          self.galaxies))
docs: Compute the total luminosity of all galaxies in this plane within a ellipse of specified major-axis.
  
          The value returned by this integral is dimensionless, and a conversion factor can be specified to convert it \
          to a physical value (e.g. the photometric zeropoint).
  
          See *galaxy.light_within_ellipse* and *light_profiles.light_within_ellipse* for details
          of how this is performed.
  
          Parameters
          ----------
          major_axis : float
              The major-axis radius of the ellipse.
          units_luminosity : str
              The units the luminosity is returned in (eps | counts).
          exposure_time : float
              The exposure time of the observation, which converts luminosity from electrons per second units to counts.