| We have considered the dependence of the sharpness of the mean light curves of Mira-type stars on the period. The correlation coefficients and regression lines have been calculated. We have derived the variations of the mean light curve depend on variations of the ascending branch versus period only. Simbad object(s): RT Cyg, R Vir, R Vul, RZ Sco, S Car, SS Cas, SS Her, T Her, V Tau, W Lyr, X Cam, R Ari, RR Boo, X Aur, SY Her, W Pup, BG Cyg, R Aql, R Boo, R Dra, ... | comments: 0 |