Histograms of the physical quantities. Panel a shows the lifetimes of SSLSs for 38 cases whose lifetimes are fully covered. The maximum total unsigned magnetic flux for all 90 cases is given in panel b; see Table 1, Col. 3. The maximum peak intensities associated with microflares of SSLSs for all 90 cases are shown in panel c; see Table 1, Col. 5. The maximum total intensity flux of SSLSs for all 90 cases is provided in panel d; see Table 1, Col. 6.