摘要：In the legend of Fig. 7, the density contrast k needs to be 100 in-
stead of 0.01. The x- and y-axis ticks of Figs. 8 and 10 need to be
[0.3,0.5,0.7,0.8,0.95] for the mass ratio and [3.2,10,32,100]
for the density contrast. However, these corrections have no in-
fluence on the results of this paper.
