The ultimate utility of the recommendation system is to rank COFs according to specific properties (for specific applications). Spearman's rank (here, a ranking of COFs) correlation coefficient, ρ, between the prediction of a missing adsorption property by the deployment low rank model and its actual value (from the test set) is shown for each adsorption property in Fig. . With the exception of H 2 O Henry coefficients, the recommendation system ranks the COFs according to their properties reasonably well, with ρ > 0.6. The relatively poor ranking of COFs by H 2 O Henry coefficient is explained by its very weak correlation with the other properties (see Fig. ).