'Comoving transverse distance in Mpc at a given redshift.
This value is the transverse comoving distance at redshift ``z``
corresponding to an angular separation of 1 radian. This is
the same as the comoving distance if omega_k is zero (as in
the current concordance lambda CDM model).
Parameters
z : array-like
Input redshifts.  Must be 1D or scalar.
Returns
d : `~astropy.units.Quantity`
Comoving transverse distance in Mpc at each input redshift.
Notes
This quantity also called the \'proper motion distance\' in some
texts.'

def comoving_transverse_distance(self, z):

    return self._comoving_transverse_distance_z1z2(0, z)
