uv2vr_cfd Help!.

Hello list,

I'm using :

plot = gsn_csm_contour_map_overlay(wks,vrt,Hgeo,res,resh)

to ploting a overlay between "Relative Vorticity and Geopotential Height"

I have:
.
.
.
  tf = addfile("CANUHELPME?.grib2","r")
  U = tf->U_GRD_GDS0_ISBL_10({650},:,:)
  V = tf->V_GRD_GDS0_ISBL_10({650},:,:)
  Hgeo = tf->HGT_GDS0_ISBL_10({650},:,:)

  wks = gsn_open_wks("x11","HELPMEXD") ;
  gsn_define_colormap(wks,"BlWhRe")

  scale = 1.e05
  vrt = U
  vrt = uv2vrG_Wrap(U,V)
.
.
.
and is perfect, but is not what i want.

uv2vrG_Wrap(U,V) Computes the vorticity via spherical harmonics and i need
Compute it using centered finite differences.

For that i founded :

uv2vr_cfd()

cool!! =D:::....

but i tried writting:
.
.
.
  scale = 1.e05
  vrt = U
  vrt = uv2vr_cfd(U,V,:,:,3)
.
.
.
and simply i can't plot it.

I have been looking for examples and more documentation about that function
but... i'm lost =D.

Regards,

--
Tomás Hernández
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