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. 2007 Feb 16;92(10):3442–3447. doi: 10.1529/biophysj.106.098442

FIGURE 4.

FIGURE 4

Projection of the MD sampling over polar angles plane defining the carbon monoxide orientation with respect to the heme plane. Note that the out-of-plane angle θ is zero when the CO molecule is perpendicular to the heme plane.