_RL exf_outscal_ustress
& exf_outscal_ustress,
fu(i,j,bi,bj) = exf_outscal_ustress*ustress(i,j,bi,bj)
fu(i,j,bi,bj) = exf_outscal_ustress*
& exf_outscal_hflux, exf_outscal_ustress, exf_outscal_vstress,
exf_outscal_ustress = 1. _d 0