code: def join(self, t2, unique=False):
          
  
          lonv1 = np.concatenate((self.lons, t2.lons), axis=0)
          latv1 = np.concatenate((self.lats, t2.lats), axis=0)
  
          ## remove any duplicates
  
          if not unique:
              lonv1, latv1 = remove_duplicate_lonlat(lonv1, latv1)
  
          return lonv1, latv1
docs: Join this triangulation with another. If the points are known to have no duplicates, then
          set unique=True to skip the testing and duplicate removal