Fraction of the ISM, present in the wake of the galaxies, compared to the total amount of ISM is plotted versus simulation time. a), c) High ram pressure, b), d) low ram pressure. In a) and b), the behaviour of the different model galaxies is depicted to show the influence of a stellar bulge. In c) and d) we show the model galaxy 1nb, flying with different inclination angles with respect to the wind.