Run 1015, Ring 1, 22.03.1979, Run 1021, Ring 2, 05.04.1979, Run 1024, Ring 1, 23.04.1979, Run 1031, Ring 2, 21.05.1979, Run 1039, Ring 2, 01.06.1979: Measurements for and tests of a numerical hysteresis model to be used in the setting of the main magnet correction windings