Fig. 7. Carbon-13 nuclear magnetic resonance (NMR) spectra at 75 MHz for the 2- to 8-mm mineral soil fraction (MIN-ROOT) Plot 11: (a) cross-polarization with magic-angle spinning (CPMAS); (b) CP with total suppression of sidebands (TOSS); (c) single-pulse excitation (SPE) after background correction; and (d) dipolar dephasing (DD) with total suppression of sidebands (TOSS). Main spinning sidebands (SSB) are indicated by *.