code: def mmi_to_delimited_text(self):
          
          delimited_text = 'lon,lat,mmi\n'
          for row in self.mmi_data:
              delimited_text += '%s,%s,%s\n' % (row[0], row[1], row[2])
          return delimited_text
docs: Return the mmi data as a delimited test string.
  
          :returns: A delimited text string that can easily be written to disk
              for e.g. use by gdal_grid.
          :rtype: str
  
          The returned string will look like this::
  
             123.0750,01.7900,1
             123.1000,01.7900,1.14
             123.1250,01.7900,1.15
             123.1500,01.7900,1.16
             etc...