_monitor -snes_view     <a href="https://www.mcs.anl.gov/petsc/petsc-current/src/snes/tutorials/output/ex19_tut_1.out">[Expected output]</a>
    </pre>
  </li>
  <li> Run with the same options but use geometric multigrid as the linear solver
    <pre>
     mpiexec -n 4 ./ex19 -da_refine 5 -snes_monitor -ksp_monitor -snes_view -pc_type mg     <a href="https://www.mcs.anl.gov/petsc/petsc-current/src/snes/tutorials/output/ex19_tut_2.out">[Expected output]</a>
    </pre>
    Note this requires many fewer iterat