diff --git a/.DS_Store b/.DS_Store
index c0a5b5830202b4b96dc970235930bdf020dfa843..c2fe3772e17c710c5a60741ae2d2276daf520191 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/class_ISTM.py b/class_ISTM.py
index d3f0f54241cf8b8f6582b346b14219e4454e0bb1..b9e415f508cf278318c15a3c0b719a25a9249878 100644
--- a/class_ISTM.py
+++ b/class_ISTM.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python2
 # -*- coding: utf-8 -*-
-"""
+"""  
 Created on Wed Oct 31 13:05:25 2018
 
 @author: taopeng