Hi. I was looking the in the manual, at page: 52 5.2.2 Spectral processing There is an example of processing script for NMRPipe. It mentions the line: | nmrPipe -fn REV \ which is for reversing the spectrum, since the CPMG element in a pulse sequence will make the magnetization end up negative. According to the manual: http://spin.niddk.nih.gov/NMRPipe/ref/nmrpipe/rev.html The recommendation is to do a negative Fourier Transform | nmrPipe -fn FT -neg \ Is there a special reason for | nmrPipe -fn REV \ Best Troels Emtekær Linnet