Table 2: Internal errors due to changes in stellar parameters for three stars with different temperatures. The total error in the last column includes the observational errors (0.024 dex for Fe I and 0.037 dex for Fe II).
Ion $\Delta$ $T_{{\rm eff}}$ $\Delta$ $\log~g$ $\Delta$ vt $\sqrt{\Sigma x^{2}}$
  +80 K +0.2 dex +0.2 km s-1  
HD 156681 (T = 4170 K)      
Fe I -0.01 +0.07 -0.07 0.10
Fe II -0.15 +0.16 -0.03 0.22
HD 214868 (T = 4445 K)      
Fe I +0.01 +0.07 -0.06 0.10
Fe II -0.12 +0.18 -0.04 0.22
HD 165634 (T = 4980 K)      
Fe I +0.06 +0.02 -0.06 0.09
Fe II -0.06 +0.10 -0.07 0.14

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