Fig. 4: Comparison of specific 17O NMR slices extracted from Fig. 3b.
From: Mapping the oxygen structure of γ-Al2O3 by high-field solid-state NMR spectroscopy

Deconvolution lines of 1D 17O MAS NMR spectrum at 18.8 T (a), and extracted 17O NMR slices from 4.5 ppm (b), 3.4 ppm (c) and 1.2 ppm (d) in the 1H dimension of 2D 1H{17O} D-HMQC spectrum (Fig. 3b), respectively. Letters A-C denote three fitted 4-coordinated oxygen sites (blue lines), D-E denote two fitted 3-coordinated oxygen sites (red lines).