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the corresponding number of parameters used in each model. Compared with the FRDM, the rms error for the 2149 nuclear masses is considerably reduced with WS, from 0.656 to 0.516 MeV. The number of parameters in the model is reduced from 31 to 15 (including the two parameters γ and p used in the Strutinsky procedure). One should note that several (about 12) of the FRDM parameters were prefixed by considerations other than mass-like data before making the fit [1, 2] and also that the fit in the FRDM included data on fission barriers in addition to masses. In this work, only the precisely measured nuclear masses are involved in the fit. Compared with the standard Hartree-Fock Bogoliubov (HFB) approach, the CPU time used in the calculation of nuclear mass table is much shorter with the proposed mass formula. The obtained rms error for the 1988 measured neutron separation energies S$_{n}$ with our model is obviously smaller than those of HFB calculations [3, 4]. 

Fig.4(a) shows the deviations between the calculated nuclear masses in this work from the experimental data. In Fig.4(b), we show the calculated shell corrections Δ E of nuclei with our model and the microscopic energy (mainly including the shell correction and the 

