Table 2: The dominant mode f1: comparison of temperature and surface gravity mean values and semi-amplitudes from different data sets.
Observatory $\overline{T_{\rm eff}}$ [K] $\overline{\log{g}}$ [dex] $\overline{\log{n_{{\rm He}}/n_{{\rm H}}}}$ [dex] $\Delta T_{\rm eff}$ [K] $\Delta\log{g}$ [dex]
Steward 31999.9 $\pm$ 17.3 5.262 $\pm$ 0.004 -2.59 $\pm$ 0.005 873.7 $\pm$ 16.5 0.078 $\pm$ 0.003
NOT 31927.9 $\pm$ 27.1 5.299 $\pm$ 0.004 -2.58 $\pm$ 0.007 840.9 $\pm$ 26.0 0.079 $\pm$ 0.004
SSO 32426.8 $\pm$ 67.7 5.260 $\pm$ 0.011 -2.46 $\pm$ 0.015 808.9 $\pm$ 64.9 0.082 $\pm$ 0.010
ESO 31437.7 $\pm$ 31.5 5.224 $\pm$ 0.008 -2.58 $\pm$ 0.011 793.7 $\pm$ 30.2 0.054 $\pm$ 0.008

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