Table 2: Statistical properties of the samples.
Sample $N_{\rm obj}$ Median of 12+log(O/H) Mean of 12+log(O/H) RMS of 12+log(O/H)
Sample A 139 8.010 8.003 0.233
Sample B 120 7.936 7.858 0.303
Sample C 48 497 9.016 8.976 0.166

Sample A+B		 259 7.980 7.936 0.277


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