_RS epsil
epsil = 1. _d -9
& / MAX( epsil,(_hFacS(i, j ,k,bi,bj)+_hFacS(i-1, j ,k,bi,bj))
& / MAX( epsil,(_hFacW( i ,j,k,bi,bj)+_hFacW( i ,j-1,k,bi,bj))
& / MAX( epsil,
& )/MAX( epsil, hFacZ(i,j)+hFacZ(i,j+1) )
& )/MAX( epsil, hFacZ(i,j)+hFacZ(i+1,j) )