  More than about 50% stars of galaxies are in binaries, but most stellar
population studies take single star-stellar population (ss-SSP) models, which
do not take binary interactions into account. In fact, the integrated
peculiarities of ss-SSPs are various from those of stellar populations with
binary interactions (bs-SSPs). Therefore, it is necessary to investigate the
effects of binary interactions on the Lick indices and colours of populations
detailedly. We show some formulae for calculating the difference between the
Lick indices and colours of bs-SSPs, and those of ss-SSPs. Twenty-five Lick
indices and 12 colours are studied in the work. The results can be conveniently
used for estimating the effects of binary interactions on stellar population
studies and for adding the effects of binary interactions into existing ss-SSP
models. The results and a few procedures can be obtained on request to the
authors or via http://www.ynao.ac.cn/~bps/zhongmu/download.htm
