Comparison of [Fe/H] and ﹩\mathrm{log}g﹩ derived with microturbulence fixed to 0.85 km s⁻¹ or set using the empirical relation of Ramirez et al. (2013). In orange are stars with ﹩\mathrm{log}g﹩ < 4, and in blue those with ﹩\mathrm{log}g﹩ > 4. The dashed black line in the top panel is the fit to the mean [Fe/H] trend of our sample discussed in Section 5. The differences in [Fe/H] do not correspond closely to our trend. The differences in ﹩\mathrm{log}g﹩ are of much larger magnitude, and allowing the microturbulence to vary returns gravities inconsistent with those of asteroseismology.