diff --git a/src/VTK/post.f90 b/src/VTK/post.f90
index d84fa123a06764fd93324c04e7f3f1a6b708e74c..0a8801b1ee856087d8be56baa3bde61964286d4a 100644
--- a/src/VTK/post.f90
+++ b/src/VTK/post.f90
@@ -363,10 +363,12 @@ end do
                 i=1,npcl)
 
    ! read isostasy basal displacement array - dwhipp 11/09
+   read (7) nb
+   dxy=1.d0/real(nb)
    !dxy=abs(ov%x(1)-ov%x(2))
-   dxy=1.d0/128.d0
+   !dxy=1.d0/128.d0
    !nb=int(1.d0/dxy)
-   nb=128
+   !nb=128
    allocate(zisodisp(nb+1,nb+1),zisoslx(nb+1,nb+1))
    if (1==1) read (7) ((zisodisp(i,j),j=1,nb+1),i=1,nb+1)