Extended Data Fig. 10: Illustration of the background subtraction for the calculated F(z) curves.
From: Direct assessment of the acidity of individual surface hydroxyls
Grey dashed lines are calculated F(z) curves at the high-symmetry A and C sites on the hydroxylated and the water-free In2O3(111) surface, each for two different azimuthal tip orientations. The average of the eight curves is shown as a grey solid line. In the background-correction procedure, this curve is subtracted from all calculated F(z) curves above surface OH groups. Black and red graphs show the data for the OWH and OSH(β) groups before background subtraction (dashed, calculated curves for two tip orientations; solid, average of the two dashed curves).
