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: -0.021
Derivative convergence rate at refinement 0: -0.084
Function   convergence rate at refinement 1: 1.7
Derivative convergence rate at refinement 1: 0.8
Function   convergence rate at refinement 2: 1.8
Derivative convergence rate at refinement 2: 0.84