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The schematic illustration for determining the expected movement P⃑i0 of the ith Cα atom. The dashed, dotted, and solid vectors show the contributions from steric clash (from j), hydrogen-bonding (with k), and irregular local structure (from i-1) to the expected movement, respectively. The dashed-dotted line is vertical to P⃑i0 and random movements always point to the same side of P⃑i0.
