Table 13: Sensitivities of Fe abundances to variations in the atmospheric parameters for typical stars in the three clusters.
Star $\sigma_{T\rm {eff}}$ $\sigma_{\log g}$ $\sigma_{\xi}$
  $\Delta$ $T_{\rm eff}$ = $\pm100$ K $\Delta{\log g}=\pm0.2$ dex $\Delta{\xi}=\pm0.15$ km s-1
c9 (NGC 3960) +0.09/-0.06 +0.01/0.00 -0.05/+0.06
17 (Be 32) +0.09/-0.07 +0.01/0.00 -0.05/+0.06
542 (NGC 2660) +0.09/-0.07 +0.01/0.00 -0.05/+0.06

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