diff --git a/field.py b/field.py
index b13e2da..a9dfb30 100644
--- a/field.py
+++ b/field.py
@@ -6,7 +6,7 @@ class Field3d:
         self.data      = numpy.array(data)
         self.origin    = tuple([float(x) for x in origin])
         self.spacing   = tuple([float(x) for x in spacing])
-        self.eps_collapse = 1e-12
+        self.eps_collapse = 1e-7
         self._dim = None
         return