diff --git a/CurveComposite.cpp b/CurveComposite.cpp
index e41cd12..dbb3e3b 100644
--- a/CurveComposite.cpp
+++ b/CurveComposite.cpp
@@ -1484,7 +1484,7 @@ CurveComposite::ApproxWithArcsEx( double dLinTol, double dAngTolDeg, double dLin
    PA.SetExtrusion( m_VtExtr) ;
 
   // eliminazione dei punti in tolleranza (opportunamente diminuita)
-   return PA.RemoveAlignedPoints( 0.75 * dLinTol) ;
+   return PA.RemoveAlignedPoints( 0.5 * dLinTol) ;
 }
 
 //----------------------------------------------------------------------------