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

**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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