You don't say what spectrometer or processing software you are using. However, in general if this is a 3D data set you can process the first full F1F3 2D plane (in VnmrJ use wft2da(1)). I'd first set the zero-order and first-order phases to zero (lp1,rp1). Then you can phase the data by selecting a horizontal slice at the upper right and displaying it (use the F1F3 page in the Display folder-use the "Show 1D Slice" button at upper right in the panel). Then phase the spectrum using the mouse in the normal way, but only to change rp1. Then redisplay the 2D F1F3 data and select a slice for a peak in the lower left. Again, select the "Show 1D Slice", click at the right and click at the left. Phase up the spectrum peaks at the left (this sets lp1). You may have to repeat the rp1/lp1 phasing steps until the spectrum is phased.

You should be able to phase the data in F3 by doing wft(1) and phasing normally.

It looks just like your phasing is off, giving you negative portions of your lines

George Gray Agilent Technologies

If f1180='y', the first time point in the indirect dimension starts at one-half the dwell time rather than zero, and the phase should be rp1=90 and lp1=-180. In NMRpipe the phases should be -90 and 180. You may still need to slightly touch up the phasing as described by George.

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