The Table  4 presents key parameters used for the recording of these three experiments, i.e., 4D APSY-HACANH, 5D APSY-HACACONH and 5D APSY-CBCACONH.

Values of the projection angles (α, β, γ) and the projection angle-dependent sweep widths ( SW ) used when collecting the HA–CA(CB) data set of Table  4 .

The GAPRO analysis of the projection spectra with the commonly used parameters (Tables  1 , 4 ) often reports only one of these two peaks, since all projections with projection angles that do not resolve the HA dimension do not contribute to the support, S , for the second glycine peak.

For this peak, S may then be below the minimal support, S_min (Table  4 ), so that it will not appear in the final peak list (Hiller et al.

The lower part of Table  4 lists the numbers of expected and observed correlations for the three experiments used in the HA–CA(CB) approach.

Using the boldly printed correlations from the HA–CA(CB) combination of APSY-NMR experiments (Table  4 ) as input for the automatic assignment program GARANT (Bartels et al.

All expected correlations were obtained with sixteen or more projections, and therefore the numbers of projections listed in Table  4 were used.