diff --git a/opendm/dem/ground_rectification/bounds/types.py b/opendm/dem/ground_rectification/bounds/types.py
old mode 100755
new mode 100644
index da6a79ab7..72af4eb3c
--- a/opendm/dem/ground_rectification/bounds/types.py
+++ b/opendm/dem/ground_rectification/bounds/types.py
@@ -37,6 +37,7 @@ def corners(self):
         return self._corners
 
 class BoxBounds(object):
+
     def __init__(self, x_min, x_max, y_min, y_max):
         self._corners = (x_min, x_max, y_min, y_max)
 
@@ -76,9 +77,11 @@ def divide_by_point(self, point):
         """Divide the box into four boxes, marked by the point. It is assumed that the point is inside the box"""
         [x_point, y_point] = point
         (x_min, x_max, y_min, y_max) = self._corners
+        x_point_eps = x_point + EPSILON
+        y_point_eps = y_point + EPSILON
         return [
             BoxBounds(x_min, x_point,           y_min, y_point),
-            BoxBounds(x_point + EPSILON, x_max, y_min, y_point),
-            BoxBounds(x_min, x_point,           y_point + EPSILON, y_max),
-            BoxBounds(x_point + EPSILON, x_max, y_point + EPSILON, y_max)
+            BoxBounds(x_point_eps, x_max, y_min, y_point),
+            BoxBounds(x_min, x_point,           y_point_eps, y_max),
+            BoxBounds(x_point_eps, x_max, y_point_eps, y_max)
         ]