Table 2: Sensitivity of the three indicators [O I], O I and OH to changes of 100 K in effective temperature, 0.3 dex in gravity and metallicity, and 0.5 km s-1 in microturbulence.
    $\Delta T_{\rm eff}=\pm100$ K $\Delta \log{g}=\pm0.3$ dex $\Delta$[Fe/H$] =\pm0.3$ dex $\Delta\xi_{\rm t}=\pm0.5$ km s-1
[O I]  Star $\Delta$[O/H] $\Delta$[O/H] $\Delta$[O/H] $\Delta$[O/H]
  HD 22049 $\pm$0.01 $\pm$0.14 $\pm$0.09 $\pm$0.001
  HD 37124 $\pm$0.01 $\pm$0.14 $\pm$0.08 $\pm$0.001
  HD 9826 $\pm$0.01 $\pm$0.14 $\pm$0.09 $\pm$0.01
O I Star $\Delta$[O/H] $\Delta$[O/H] $\Delta$[O/H] $\Delta$[O/H]
  HD 22049 $\mp$0.14 $\pm$0.09 $\pm$0.02 $\mp$0.02
  HD 37124 $\mp$0.10 $\pm$0.05 $\pm$0.02 $\mp$0.02
  HD 9826 $\mp$0.07 $\pm$0.05 $\pm$0.02 $\mp$0.03
OH Star $\Delta$[O/H] $\Delta$[O/H] $\Delta$[O/H] $\Delta$[O/H]
  HD 22049 $\pm$0.05 $\mp$0.03 $\pm$0.18 $\pm$0.001
  HD 37124 $\pm$0.10 $\mp$0.05 $\pm$0.20 $\pm$0.001
  HD 9826 $\pm$0.12 $\mp$0.05 $\pm$0.20 $\pm$0.001
1 These sensitivities are based on the method described in Sect. 3.1. The values can be slightly
  larger if more explicit calculations are carried out.

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