Fraction of stars with perturbed discs after 2 Myr of evolution as a function of the stellar number volume density in the central cluster region (r_centre = 0.3 pc). Circles represent the results of an initial r^-1 disc-mass distribution, while crosses show the constant and open squares the r^−7/4 distributions. The line represents a smooth Bezier fit to the data points for the r^-1 distribution. The error bars indicate the standard deviation for p = 1, which is of the same order for the other distributions.