fix: PostPlot data path

Python_script/PostPlot.py

@@ -114,7 +114,7 @@ class PostPlot:
         if not os.path.exists(storepath):
             os.makedirs(storepath)
         
-        self.fig.savefig(storepath + '\\' + filename)
+        self.fig.savefig(os.path.join(storepath, filename))
     
     # scaling time axes depending on the time unit
     def scaling_time_axes(self, time_sec, time_unit):