Table 2: Dependency of $t^2_{\rm s}$ on the number of apertures N.
  $t^2_{\rm s}(N)/t^2_{\rm s}(N'=100)$ (per cent)
N Bac O III N II  O I Ar III C I
5 60-90 62-91 45-88 00-27 70-98 28-83
10 85-97 84-96 67-92 25-56 83-99 58-87
20 97-99 94-99 84-94 41-78 92-99 79-92


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