Differences between the spectroscopic surface gravities adopted here, and photometric surface gravities for 39 stars in the UVES-FIES sample for which the photometry are not significantly affected by interstellar absorption and for which precise parallaxes are available from Gaia DR2. A line of best fit is overdrawn, that excludes the obvious outlier HD 120559 (log g_phot. = 4.33), for which the measured Gaia DR2 parallax, π = 29.19 ± 0.18 mas may be in error; the Hipparcos parallax, π = 39.42 ± 0.97 mas, gives log g_phot. = 4.64, in much better agreement with the spectroscopic value (log g_spec = 4.58).