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Values of B12 for H2 with CO at low temperatures, calculated with full consideration of flexibility and quantum effects with the PIMC approach, and compared with experimental data. Uncertainties for the calculations are smaller than the size of the symbols except for the four lowest temperatures. The virials computed from the V15(r0) potential are not shown since they would be nearly indistinguishable from those computed from the Utot,15 potential.
