IF (ok_hf) THEN
c
         PRINT*, 'La frequence de sortie instant. est de ', ecrit_hf

cccIM    CALL ymds2ju(anne_ini, 1, 1, 0.0, zjulian)
         idayref = day_ref
         CALL ymds2ju(annee_ref, 1, idayref, 0.0, zjulian)

c
         CALL gr_fi_ecrit(1,klon,iim,jjmp1,rlon,zx_lon)
         DO i = 1, iim
            zx_lon(i,1) = rlon(i+1)
            zx_lon(i,jjmp1) = rlon(i+1)
         ENDDO

         CALL gr_fi_ecrit(1,klon,iim,jjmp1,rlat,zx_lat)

cccIM      CALL histbeg("histhf", iim,zx_lon, jjmp1,zx_lat,
         CALL histbeg("histhf", iim,zx_lon(:,1), jjmp1,zx_lat(1,:),
     .                 1,iim,1,jjmp1, itau_phy, zjulian, dtime, 
     .                 nhori, nid_hf)

         CALL histvert(nid_hf, "presnivs", "Vertical levels", "mb",
     .                 klev, presnivs, nvert)
         zsto = dtime

c   pour les champs instantannes, il faut mettre la meme valeur pour
c   zout et tsto.
c   dtime est passe par ailleurs a histbeg

         zout = dtime * REAL(NINT(86400./dtime*ecrit_hf))
         zsto = zout
         print*,'zout,zsto=',zout,zsto

c
c        CALL histdef(nid_hf, "phis", "Surface geop. height", "-",
c    .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
c    .                "once", zsto,zout)
c
c        CALL histdef(nid_hf, "aire", "Grid area", "-",
c    .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
c    .                "once", zsto,zout)
c
c Champs 2D:
c
         CALL histdef(nid_hf, "tsol", "Surface Temperature", "K",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)
c
         CALL histdef(nid_hf, "psol", "Surface Pressure", "Pa",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)
c
         print*,'ATTENTION METTRE AVE(X) POUR LES PRECIPS'

         CALL histdef(nid_hf, "rain", "Precipitation", "mm/d",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)
c
         CALL histdef(nid_hf, "u850", "Zonal wind 850mb", "m/s",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)

         CALL histdef(nid_hf, "v850", "Meridional wind 850mb", "m/s",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)
c
         CALL histdef(nid_hf, "u500", "Zonal wind 500mb", "m/s",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)

         CALL histdef(nid_hf, "v500", "Meridional wind 500mb", "m/s",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)

         CALL histdef(nid_hf, "u200", "Zonal wind 200mb", "m/s",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)

         CALL histdef(nid_hf, "v200", "Meridional wind 200mb", "m/s",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)

         CALL histdef(nid_hf, "phi500", "Geopotentiel à 500mb", "m2/s2",
     .                iim,jjmp1,nhori, 1,1,1, -99, 32, 
     .                "inst(X)", zsto,zout)

c
         CALL histend(nid_hf)

      endif ! ok_hf