docs: def labelAxes(self, numLines=(5,5)):
          """Put labels on axes
  
          Note: I should do better than this by picking round numbers
          as the places to put the labels.
  
          Note: If I ever do rotated projections, this simple approach
          will fail.
          """
  
          x1, x2, y1, y2 = mp.axis()
          ra1, dec0 = self.pixToSky(x1, y1)
          raRange, decRange = self.getRaDecRanges(numLines)
          ax = mp.gca()
  
          x_ticks = self.skyToPix(raRange, dec0)[0]
          y_ticks = self.skyToPix(ra1, decRange)[1]
  
          ax.xaxis.set_ticks(x_ticks)
          ax.xaxis.set_ticklabels([str(int(i)) for i in raRange])
          mp.xlabel("Right Ascension (deg)")
  
          ax.yaxis.set_ticks(y_ticks)
          ax.yaxis.set_ticklabels([str(int(i)) for i in decRange])
          mp.ylabel("Declination (deg)")