diff --git a/tcl/mango.config b/tcl/mango.config
index 04f2f05..8030045 100644
--- a/tcl/mango.config
+++ b/tcl/mango.config
@@ -23,6 +23,8 @@ cc hem 550
 # 250 l vessel:
 cc hem0 720
 
+GraphAdd hefill.smooth % smooth 
+
 if {0} {  # magnet manually
 
 makenv mf -driver smc -port Prologix-00-21-69-01-19-57:1234