Figure 7.

(a) Regular 1D spectrum of cholic acid (10 mg in methanol-d₄), recorded with 16 scans, 32 768 data points, and a spectral width of 8000 Hz. (b) A regular HSQC spectrum without J-scaling (λ = 1), 128 increments with 16 scans each, and 512 data points in the direct dimensions. The spectral widths of direct and indirect dimensions are 1500 × 6290 Hz. (f) A J-upscaled HSQC with λ = 6 and the same spectral parameters as in part b but double the number of scans. (c–e) 1D extracts of one particular signal, as indicated in red from a regular spectrum and in blue from a J-upscaled HSQC. The signal indicated by an asterisk is from a λ = 9 HSQC to resolve the splittings completely.