new_contents: """
  Cyl: Plot Grid
  ================
  
  You can use :code:`mesh.plotGrid()` to plot a z and theta slice through a
  3D cyl mesh.
  
  If you wish to plot only one slice, you can use
  :code:`mesh.plotGrid(slice='z')` or :code:`mesh.plotGrid(slice='theta')
  
  """
  import discretize
  import matplotlib.pyplot as plt
  
  
  def run(plotIt=True):
      mesh = discretize.CylMesh([7, 6, 10])
      mesh.plotGrid()
      mesh.plotGrid(slice='z')
      mesh.plotGrid(slice='theta')
  
  if __name__ == '__main__':
      run()
      plt.show()
  
subject: include an example plotting the 3D cyl mesh