update arg_fit.py.

Signed-off-by: Sgr A* VMT <1611902585@qq.com>

arg_fit.py

@@ -133,5 +133,5 @@ def main():
     print('tc_tcc:'+str(params[0])+'\ntc_tcfl:'+str(params[1])+'\ntc_tctl:'+str(params[2]))
 
 if __name__== "__main__" :
-    threshold＝250
+    threshold=250
     main()