e

   a public type used to store data needed by the 
       multi-step version of the diffusion algorithm


  real, pointer, dimension(:,:) :: dtmass,    &
                                   dflux_t,   & 
                                   dflux_q,   & 
                                   delta_t,   &
                                   delta_q
 


        for full description of these fields, and the rationale for 
              saving these particular fields, 
                 see  <A HREF="vert_diff.tech.