Comparison of our synthetic HB with the observed HB morphology for globular cluster NGC 2808. The basic parameters of NGC 2808 are as labeled. The number ratio of stars, B:V:R, in different parts of the HB for this cluster derived from observations are also shown. The black + in this figure denote the observational data of HB stars for this GC. The red dots and the red asterisks denote the synthetic HB stars obtained from our model calculations, as in Fig. 2. The photometric data for NGC 2808 are taken from Piotto et al. (2002).