The theoretical refocusing profile of a shaped 180 degree pulse can be visualized from the NMRSIM program:

1. Select the corresponding File-->Experiment Setup-->Load from File ... menu.
2. Choose the spfge.cfg configuration file. If desired, the following standard parameters can be modified in the Go-->Check Experiment parameters menu:
• The pulse program is spfge.seq
• The spin system is a.ham
• The pulse shape is gauss.shp. Choose another SPNAM1 shape if desired.
• The pulse duration is 10 ms. Choose another P5 value if desired.
3. Select the Go-->Run Experiment menu.
4. The result of the simulation is displayed in the nmrsim 1 1 file into the XWIN-NMR window. Transform the data with ef (lb=1).