Chern number versus γ and m with disorder strength W = 3. (a) is calculated by cylindrical samples. The solid red line is the phase boundary of the clean cylindrical sample, and the solid blue line roughly separates the regions with a quantized and un-quantized Chern number. (b) is calculated by the square sample, and the solid red line is the phase boundary of the clean sample. The other parameters are the same as those in Fig. 2.