This is for quantitative 31P (phosphorous) NMR of lignin. I am using Bruker Topsin 4.0.6 for processing. I am visually comparing multiple NMR spectra in one window by plotting them together. However, the heights of peaks in every spectrum is also dependent on the sample weight, which is not perfectly constant. This small variation in sample weights interferes with the peak intensities. Can I somehow normalize the peaks with sample weight so that I get peak intensities compensated for the individual sample mass?