code: def source_table(self):
          
          table = Table()
          table['GLON'] = np.array([0, 45, 45], dtype='float32')
          table['GLAT'] = np.array([0, 0, 45], dtype='float32')
          table['COUNTS'] = np.array([100, 100, 100], dtype='int32')
          return table
docs: Source table  (`~astropy.table.Table`).
  
          Columns: GLON, GLAT, COUNTS