Table 4: Cluster and field-star statistics.
  M 52   NGC 3960
$\Delta R$ $N_{\rm obs}$ $f_{\rm cl}$ $f_{\rm fs}$   $N_{\rm obs}$ $f_{\rm cl}$ $f_{\rm fs}$
($^\prime $) (stars) (%) (%)   (stars) (%) (%)
(1) (2) (3) (4)   (5) (6) (7)
0-3 313 63 37   210 51 49
3-6 601 43 57   434 28 72
6-9 726 21 79   582 11 89
9-12 874 8 92   803 9 91
12-15 1053 2 98   927 0 100
Total field 3567 20 80   2029 18 82
Notes. Columns 2 and 5: number of observed stars in the region; Cols. 3 and 6: fraction of member stars; Cols. 4 and 7: fraction of field stars. Total field is $R=15\hbox{$^\prime$ }$ for M 52 and $R=12\hbox{$^\prime$ }$ for NGC 3960.

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