code: def map_V_to_height(self, alat, alon, height, newheight, V):
          
  
          return self._map_EV_to_height(alat, alon, height, newheight, V, 'V')
docs: Performs mapping of electric drift velocity along the magnetic field.
  
          It is assumed that the electric field is perpendicular to B.
  
          Parameters
          ==========
          alat : (N,) array_like or float
              Modified apex latitude
          alon : (N,) array_like or float
              Modified apex longitude
          height : (N,) array_like or float
              Source altitude in km
          newheight : (N,) array_like or float
              Destination altitude in km
          V : (3,) or (3, N) array_like
              Electric drift velocity (at `alat`, `alon`, `height`) in geodetic
              east, north, and up components
  
          Returns
          =======
          V : (3, N) or (3,) ndarray
              The electric drift velocity at `newheight` (geodetic east, north,
              and up components)