diff_calc_angles(), fc_calc_angles()

diff_calc_angles( h, k, l)
diff_calc_angles( h, k, l, param)
diff_calc_angles( h, k, l, param, index)
diff_calc_angles( h, k, l, , index)

fc_angles( h, k, l)
fc_angles( h, k, l, param)
fc_angles( h, k, l, param, index)
fc_angles( h, k, l, , index)

Returns the angles that belong to $hkl$. Param is an optional parameter for the fixed phi, fixed phi or fixed (omega-two_theta/2) mode. Index varies from 1 to 4, selecting two_theta, omega, chi or phi. If index is omitted, all angles are returned.

e.g.:
* = diff_angles( 1, 1, 1)