functions. However, two intriguing features are seen, which has not been noticed previously, to our knowledge. The rst concerns the S OO (k) peaks marked with dashed lines, at k M P ≈ 1.7 Å-1 , well marked for methanol, but less apparent ethanol, more like a attening. This k-value corresponds to the distance r ≈ 2π/k M P ≈ 3.5 Å, which is quite close to the diameter of the oxygen atom in the OPLS models σ O ≈ 3.1 Å. In other words, this peak corresponds to an OO contact.