These are standard x,y,z format datasets, e.g., for h3o+_32141 there are
32141 configurations and energies.  Here is a sample.

4
     0.00016022
H    -0.00020399    -0.93963414     0.23963438
H    -0.80718148     0.45628169     0.23136251
H     0.81370014     0.46028078     0.23361999
O    -0.00039788     0.00145372    -0.04439720

4 = no. of atoms
energy in hartree
cartesian coordinates of each atom indicated (in A)

These datasets are described briefly in "Assessing Gaussian Process Regression and Permutationally Invariant Polynomial Approaches to Represent 
High-Dimensional Potential Energy Surfaces" Chen Qu, Qi Yu, Brian L. Van Hoozen, Joel M Bowman, and Rodrigo A. Vargas-Hernandez Journal of Chemical Theory and Computation 
Just Accepted Manuscript DOI: 10.1021/acs.jctc.8b00298.  That paper also has citations to the original publications where the datasets and PIP PESs etc were reported.  We would prefer both the paper above and the original one to be cited if you use the dataset.
