diff --git a/script/Electric_field_loop3.py b/script/Electric_field_loop3.py
index 90cca57..777166e 100644
--- a/script/Electric_field_loop3.py
+++ b/script/Electric_field_loop3.py
@@ -64,7 +64,7 @@ for k in range(0,21):
     sleep(0.1);
 
 for k in range(0,len(loops)):
-    filename=open(output_file + str(k)+ +"_" +suffix+ ".dat","a")
+    filename=open(output_file + str(k)+"_"+suffix+ ".dat","a")
     for i in range(0,len(forward)):
         print "Setting field = ", forward[i]
         caput("X11MA-XMCD:I-SETraw",forward[i])