text: """
  Mercator
  ========
  
  ``M[lon0/][lat0/]width``: Give central meridian ``lon0`` (optional) and
  standard parallel ``lat0`` (optional).
  """
  import pygmt
  
  fig = pygmt.Figure()
  fig.coast(region=[0, 360, -80, 80], frame="afg", land="gray", projection="M0/0/8i")
  fig.show()
  