Strength of NG acceleration acting on cometary nuclei at perihelion for the sample of Oort spike comets. Solutions obtained in KD17 are shown by light red (NG orbit based on the standard g(r) function) and blue dots (g(r)-like function adequate for CO-sublimation). The solutions presented here are shown by green squares, magenta triangles, and red dots, all of which represent preferred solutions based on the standard g(r)-function. The two solutions marked as cyan dots represent models for C/2012 S1 and C/2002 O7 based on the CO-driven formula.