The ratio of external rotation blended in each of the eGNM modes as a function of the mode index for myoglobin (1a6m, 151 residues). (Inset) Zoom-in figure for the first 60 low modes. Note that every three eGNM modes correspond to one GNM mode. For instance, modes 31 to 33 correspond to the 10th GNM mode. In eGNM, the first three modes are translational modes, led by zero eigenvalues. (Innermost inset) Relation between Vk, V′k, and Vk − V′k forms a right triangle.