The spectrum produced by this experiment has 3 dimensions: A proton axis, a N axis and a C axis. For residue i peaks will appear at {H N (i), N(i), C α (i-1)} only, while for the complementary HNCA experiment peaks appear at {H N (i), N(i), C α (i-1)} and {H N (i), N(i), C α (i)}. Together, these two experiments reveal the alpha carbon chemical shift for each amino acid residue in a protein, and provide information linking adjacent residues in the protein's sequence.