Figure 6.

Schematic representation of the pulse sequence used to acquire two-dimensional proton–proton chemical-shift correlation spectra with high resolution through FSLG decoupling achieved in $t_{\mathrm{1}}$ . The final 90 ${}^{\circ }$ pulse is phase cycled together with the receiver through all four quadrature phases. States-type phase-sensitive detection in the indirect dimension is implemented by shifting the phase of the first 90 ${}^{\circ }$ pulse and the spin lock by 90 ${}^{\circ }$ . To select parts of the sample by the I-BURP-2 pulse in the spin-lock frame, two scans with and without the inversion pulse were subtracted by shifting the receiver phase by 180 ${}^{\circ }$ .