diff --git a/VolTriZmapVolume.cpp b/VolTriZmapVolume.cpp
index 6f9dd7a..5b2de44 100644
--- a/VolTriZmapVolume.cpp
+++ b/VolTriZmapVolume.cpp
@@ -3921,7 +3921,8 @@ VolZmap::CompConus_Drilling( unsigned int nGrid, const Point3d & ptS, const Poin
    for ( unsigned int i = nStartI ; i <= nEndI ; ++ i) {
    
       for ( unsigned int j = nStartJ ; j <= nEndJ ; ++ j) {
-      
+
+         
          double dX = ( i + 0.5) * m_dStep ;
          double dY = ( j + 0.5) * m_dStep ;
 
@@ -3960,15 +3961,15 @@ VolZmap::CompConus_Drilling( unsigned int nGrid, const Point3d & ptS, const Poin
             
             if ( ptInt1.z < ptInt2.z) {
 
-               dMin = ptInt1.z + vtV1.z * dL ;
-               dMax = ptInt2.z + vtV1.z * dL ;
+               dMin = ptInt1.z /*+ vtV1.z * dL*/ ;
+               dMax = ptInt2.z /*+ vtV1.z * dL*/ ;
                vtNmin = vtN1 ;
                vtNmax = vtN2 ;          
             }
             else {
 
-               dMin = ptInt2.z + vtV1.z * dL ;
-               dMax = ptInt1.z + vtV1.z * dL ;
+               dMin = ptInt2.z /*+ vtV1.z * dL*/ ;
+               dMax = ptInt1.z /*+ vtV1.z * dL*/ ;
                vtNmin = vtN2 ;
                vtNmax = vtN1 ;        
             }