To proceed, we give histograms of five H-matrix elements for these molecules obtained, with one exception, using MULTIMODE, which uses the exact Watson Hamiltonian with a direct product basis and the n-mode representation of full-dimensional ab initio potential energy surfaces. Potential matrix elements were calculated using optimized numerical quadrature. In one case, 4-mode vinyl, the H-matrix was obtained using a direct-product of numerical basis functions in the normal coordinates of the saddle-point separating the two equivalent minima in vinyl. Details of the steps used in these calculations have been given