diff --git a/code/termspecs/termspec.vnsd_fluctuation b/code/termspecs/termspec.vnsd_fluctuation
index d3e3fca..36598af 100644
--- a/code/termspecs/termspec.vnsd_fluctuation
+++ b/code/termspecs/termspec.vnsd_fluctuation
@@ -12,7 +12,10 @@ nx = - ddx(c) / fsd
 ny = - ddy(c) / fsd
 nz = - ddz(c) / fsd
 
-vn = u * nx + v * ny + w * nz
+unx = u * nx
+vny = v * ny
+wnz = w * nz
+vn = unx + vny + wnz
 
 divn = ddx(nx) + ddy(ny) + ddz(nz)
 
@@ -35,7 +38,7 @@ gradt_vnsd1 = ddx(vnsd) - nx * gradn_vnsd
 
 divn2_dndn = divn2 - gradn_gradn
 
-sign_divn2_dndn = $dsign(divn2_dndn, divn)
+sign_divn2_dndn = $dsign(1.0, divn) * divn2_dndn
 
 vnsd_divn = vnsd * divn
 
@@ -55,7 +58,10 @@ vnsd_sign_divn2_dndn = vnsd * sign_divn2_dndn
 
 avg { c, u, v, w, fsd, lapc, ddx_c, ddy_c, ddz_c, d2dx_c, d2dy_c, d2dz_c }
 
-avg fsd { u, v, w, nx, ny, nz, absk, divn, sd, gradt_vnsd1,
+avg fsd { u, v, w, nx, ny, nz, absk, divn,
+unx, vny, wnz,
+vn, sd,
+gradt_vnsd1,
 vnsd,
 vnsd_divn,
 vnsd_divn_cor,