The invention relates to a method for reducing nitrogen oxides from the exhaust gas of a coke oven, which has a plurality of coking chambers and heating walls, arranged between the coking chambers, with heating flues for the indirect heating of the coking chambers. The first portion has a base with at least one aperture and a resilient flange portion that extends away from and above the base and faces a first direction. Furthermore, an interlayer dielectric layer covers the memory array region, the buried gate transistor and the planar gate transistor. Based on the calculated time, a control signal for stopping the paper feeding mechanism is generated. The absolute number of stone cells per unit area or a stone cell size-distribution-plot is obtained using one of automated or manual image analysis.