Table 2: Sensitivities of the copper and zinc abundances to variations in the atmospheric parameters of the stars HD 94028 ( $T_{\rm eff}$ = 6058 K, log g = 4.28, $V_{\rm t}$ = 1.0 km s-1), HD 140283 ( $T_{\rm eff}$ = 5723 K, log g = 3.68, $V_{\rm t}$ = 1.0 km s-1) and G170-47 ( $T_{\rm eff}$ = 5154 K, log g = 2.93, $V_{\rm t}$ = 1.25 km s-1), and to the overshooting.
  HD 94028 HD 140283 G170-47
  $T_{\rm eff}$ log g $V_{\rm t}$ Os $T_{\rm eff}$ log g $V_{\rm t}$ Os $T_{\rm eff}$ log g $V_{\rm t}$ Os
  +100 +0.30 -0.3 off +100 +0.30 -0.3 off +100 +0.30 -0.3 off
[Cu/H] +0.15 -0.06 +0.13 -0.15 +0.12 0.00 +0.02 -0.13 +0.13 0.00 +0.04 -0.15
[Zn/H] +0.06 +0.03 +0.01 -0.10 +0.06 +0.04 0.00 -0.10 +0.04 +0.04 0.00 -0.09


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