“…The incompatibility between line intensity and field splitting may theoretically be relieved by allowing the Fe spins to move out of the a c plane during the SR; any movement of the spins away from the a axis would reduce the field splitting but such a movement towards the b axis would also maintain 2,5 line intensity. Improved fits were made in this way, the Fe spins moving approximately 40' out of the a c plane in the course of the a + c SR. (Non-planar SR is not unknown; it has been reported, for example, by Nikolov el a1 [8] for HoFeO,.) test this possibility we used an ac-plane absorber.…”