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 refinement 0: 0.14
Derivative convergence rate at refinement 0: -0.22
Function   convergence rate at refinement 1: 1.80
Derivative convergence rate at refinement 1: 0.85
Function   convergence rate at refinement 2: 1.95
Derivative convergence rate at refinement 2: 0.97