Comparison between our SPC results to those of spectroscopic surveys for T_eff (left panels), log 𝑔 (middle panels), and [Fe/H] (right panels). The differences are given as ΔX = X_SPC – X_survey. The marker color indicates the comparison survey, see the top legend (the numbers in parenthesis indicate to number of stars in common with our SPC sample). Filled triangular (square) markers indicate the SPC QF = 4 (QF = 3) targets. Top row: value difference against SPC value. Middle row: violin plots showing the distributions of the differences, with the medians given by the solid black lines and the darker shaded regions giving the standardized MAD of the differences. Bottom row: Difference distributions, as in the middle row, but normalised by the uncertainty on the differences. The horizontal shaded region provides the ±1σ region.