diff --git a/class_ISTM.py b/class_ISTM.py
index b9e415f508cf278318c15a3c0b719a25a9249878..4c01cdb3b9332fc73a471e2ba53b8ed6e8c80cf5 100644
--- a/class_ISTM.py
+++ b/class_ISTM.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 """  
 Created on Wed Oct 31 13:05:25 2018
-
+  
 @author: taopeng
 """