Table 3: Reference clusters, respective metallicities (according to Harris 1996), and $\Delta (B-V)$ corresponding to the reddening of NGC 6522 derived differentially relative to the comparison clusters.

Comparison cluster [Fe/H] $\Delta (B-V)$

M 13 -1.54 0.60

NGC 6229 -1.43 0.50

NGC 6723 -1.12 0.50

NGC 6681 -1.51 0.60

NGC 6266 -1.29 0.42

NGC 5904 -1.27 0.50

NGC 1851 -1.22 0.47

NGC 1904 -1.57 0.55

**Table 3:** Reference clusters, respective metallicities (according to Harris 1996), and $\Delta (B-V)$ corresponding to the reddening of NGC 6522 derived differentially relative to the comparison clusters.
Comparison cluster	[Fe/H]	$\Delta (B-V)$
M 13	-1.54	0.60
NGC 6229	-1.43	0.50
NGC 6723	-1.12	0.50
NGC 6681	-1.51	0.60
NGC 6266	-1.29	0.42
NGC 5904	-1.27	0.50
NGC 1851	-1.22	0.47
NGC 1904	-1.57	0.55

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