def METHOD_NAME(self, kwargs_ps, **kwargs):
    """Original source position (prior to lensing)
    :param kwargs_ps: point source keyword arguments
    :return: x, y position (as numpy arrays)
    """
    ra_source = kwargs_ps["ra_source"]
    dec_source = kwargs_ps["dec_source"]
    return np.array(ra_source), np.array(dec_source)