code: def point_source_list(self, kwargs_ps, kwargs_lens, k=None):
          
          ra_list, dec_list = self.image_position(kwargs_ps, kwargs_lens, k=k)
          amp_list = self.image_amplitude(kwargs_ps, kwargs_lens)
          ra_array, dec_array, amp_array = [], [], []
          for i, ra in enumerate(ra_list):
              for j in range(len(ra)):
                  ra_array.append(ra_list[i][j])
                  dec_array.append(dec_list[i][j])
                  amp_array.append(amp_list[i][j])
          return ra_array, dec_array, amp_array
docs: returns the coordinates and amplitudes of all point sources in a single array
  
          :param kwargs_ps:
          :param kwargs_lens:
          :return: