Table 5: The results of the statistical analysis. The values of median, skewness, kurtosis-excess are indicated for each set of metallicity measurements, in each field (C for M92C and W for M92W). The values listed in Cols. 4 and 6 give the limit for the skewness and the kurtosis-excess to be considered significantly equal to zero (see the text).
UV excess median sk. lim_sk k-ex. lim_ku

$\delta$ (X-Y)C -1.97 0.16 0.22 0.20 0.87

$\delta$ (P-Y)C -2.26 0.36 0.20 2.30 0.80

$\delta$ (P-X)C -2.94 0.16 0.23 -0.05 0.91

$\delta$ (X-Y)W -2.08 0.00 0.46 0.83 1.80

$\delta$ (P-Y)W -1.88 0.12 0.46 -0.15 1.80

$\delta$ (P-X)W -2.12 0.92 0.50 0.15 2.01

**Table 5:** The results of the statistical analysis. The values of median, skewness, kurtosis-excess are indicated for each set of metallicity measurements, in each field (C for M92C and W for M92W). The values listed in Cols. 4 and 6 give the limit for the skewness and the kurtosis-excess to be considered significantly equal to zero (see the text).
UV excess	median	sk.	lim_sk	k-ex.	lim_ku
$\delta$ (X-Y)C	-1.97	0.16	0.22	0.20	0.87
$\delta$ (P-Y)C	-2.26	0.36	0.20	2.30	0.80
$\delta$ (P-X)C	-2.94	0.16	0.23	-0.05	0.91
$\delta$ (X-Y)W	-2.08	0.00	0.46	0.83	1.80
$\delta$ (P-Y)W	-1.88	0.12	0.46	-0.15	1.80
$\delta$ (P-X)W	-2.12	0.92	0.50	0.15	2.01

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