Index: /trunk/MagicSoft/Mars/macros/tutorials/mirrordelay.C
===================================================================
--- /trunk/MagicSoft/Mars/macros/tutorials/mirrordelay.C	(revision 8318)
+++ /trunk/MagicSoft/Mars/macros/tutorials/mirrordelay.C	(revision 8319)
@@ -69,9 +69,9 @@
     c->SetGridy();
 
-    TF1 del("Diff", "(Sphere-Parab+TMath::Hypot(x-0, Parab-[0])-[0])/3e8*1e9");
-    del.SetParameter(0, F);
+    TF1 fdel("Diff", "(Sphere-Parab+TMath::Hypot(x-0, Parab-[0])-[0])/3e8*1e9");
+    fdel.SetParameter(0, F);
 
-    del.SetRange(-D*0.55, D*0.55);
-    f = (TF1*)diff.DrawClone();
+    fdel.SetRange(-D*0.55, D*0.55);
+    f = (TF1*)fdel.DrawClone();
 
     f->GetXaxis()->SetTitle("x [m]");