Instances contributed by Jordi Castro, obtained with the 3D tables generator. They are convex separable quadratic problems. They are provided in extended MPS format for quadratic problems. Section QUADOBJ/QSECTION/QUADS used for quadratic terms. Choose the right keyword according to your solver (i.e., the above are for Cplex-BPMPD/MOSEK/LoQo). The NL file generated by AMPL is also provided. The difference in objective function between the NL and MPS format is due to the constant coefficient in the quadratic function. Add coefficient f0 (see below) to the solution with MPS format for the true objective function.