Comparison of asteroseismic and spectroscopic ν_max estimates of the Kepler-Gaia matched sources described in Sect. 4.3. Stars with atmospheric parameters from APOGEE, GSP-Spec, and GSP-Phot are shown in green, purple, and pink, respectively. Circles correspond to ABs where both solar-like oscillators of an AB were matched to a Gaia source. Squares depict ABs where only one of the two oscillators was matched. The bottom panel displays the difference in units of radial order, i.e. normalised by Δν. The dotted grey lines represent differences of ±1Δν.