Function tests pass for order 0 at tolerance 1e-10
Function tests pass for order 0 derivatives at tolerance 1e-10
Function   convergence rate at coarsening 0: 0.81
Derivative convergence rate at coarsening 0: 0.37
Function   convergence rate at coarsening 1: 0.62
Derivative convergence rate at coarsening 1: 0.33
Function   convergence rate at coarsening 2: 0.58
Derivative convergence rate at coarsening 2: 0.22