Table 1. Experimental parameters: ni (number of hypercomplex increments), nuc (name of nucleus), t (maximum evolution time in ms) and sw (spectral width in Hz).

Experimental time is given in hours.

Experiment	ni	Dim 1			Dim 2			Dim 3			Exp. time
		nuc	t	sw	nuc	t	sw	nuc	t	sw
3D HNCO	1600	CO	50	2800	N	75	2500	-	-	-	12
4D HNCACO	2200	CO	50	2800	Cα	10	6200	N	75	2500	33
4D HabCabCONH	1450	Hαβ	10	7500	Cαβ	7.1	14000	N	75	2500	22
4D (H)N(CA)CONH	2500	N	28	2500	CO	28	2800	N	75	2500	40