Some bsSSP models are used for studying the CMDs of globular clusters in this work, but most
other studies use ssSSP models. In order to investigate the differences between the CMD study
results derived from bsSSP and ssSSP models, we compare the observational CMDs of two globular
clusters (M5 and NGC 6397) with those of theoretical bsSSPs and ssSSPs. The two clusters are
chosen for the study because their CMDs are intact. In Figure 4, the detailed comparison of the
observational CMDs with the best-fit theoretical CMDs of bsSSPs and ssSSPs is shown.We see that
the CMDs of best-fit bsSSPs cover larger ranges in the color versus magnitude field compared to
the best-fit ssSSPs, and the CMDs of bsSSPs are actually closer to the observational CMDs of the
two globular clusters. When comparing the properties determined by bsSSPs and ssSSPs, they are