docs: def plotOutline(self, maptype=None, colour='#AAAAAA', **kwargs):
          """Plot an outline of the FOV.
          """
  
          if maptype is None:
              maptype=self.defaultMap
  
          xarr = []
          yarr = []
          radec = self.currentRaDec
          for ch in [20,4,11,28,32, 71,68, 84, 75, 60, 56, 15 ]:
              idx = np.where(radec[:,2].astype(np.int) == ch)[0]
              idx = idx[0]    #Take on the first one
              x, y = maptype.skyToPix(radec[idx][3], radec[idx][4])
              xarr.append(x)
              yarr.append(y)
  
          verts = np.empty( (len(xarr), 2))
          verts[:,0] = xarr
          verts[:,1] = yarr
  
          #There are two ways to specify line colour
          ec = kwargs.pop('ec', "none")
          ec = kwargs.pop('edgecolor', ec)
          p = matplotlib.patches.Polygon(verts, fill=True, ec=ec, fc=colour, **kwargs)
          mp.gca().add_patch(p)