We also find that some structures are found in the threshold search, but not CSP, and vice versa. The threshold search is able to locate structures that are not accessible in the CSP because of lower symmetry constraints: some structures do not belong to either space group included in CSP. On the other hand, structures found by CSP, but not the threshold search indicate that the threshold sampling has not fully explored the energy landscape. However, we note that overlap between QR and threshold structures is very good in the important low energy region of the landscape.