NCACX-2D;
with a mixing time of d20 = 15msec
(with higher mixing time, one could go even further distance ==> more cross peaks will come from c beta too)

Tips:

1. This gives the correlation between N and C.
2. Tough in 1D-NCA it gives good sino with ns 256, for the 2D please keep ns = 1024 for to observe the cross peaks
3. for the indirect dimension one can always put 512, and could stop the experiment at any time by analyzing the fid screen