Time evolution of the ratio of the FP mass to the total cluster mass as obtained by Monte Carlo simulations described in Sect. 3. The black curve corresponds to the simulation in which a cluster was formed and spent its entire lifetime within a Sagittarius-like galaxy. The red and blue curves describe the M_FP/M_TOT evolution if the cluster is accreted by a Milky Way-like galaxy 2 − 3 Gyr and 4 − 5 Gyr after its formation, respectively.