Bootstrapping probability density functions of the power-law indices measured for the CMF high-mass end of the MM2, MM3, MM10, and Outskirts subregions. Each distribution is fitted by an EMG with negative skewness. According to their 1σ width (dotted segments), subregions appear distinct, except for MM10, whose highest probability part of the bootstrapping distribution overlaps with both the MM2 and Outskirts subregions.