add formel 18

diff --git a/owlib.py b/owlib.py
index dab4fab..434b12c 100644 (file)
--- a/owlib.py
+++ b/owlib.py
@@ -82,6 +82,8 @@ def calcValue(code,vn,V):
                return V[vn]/32.0;  
        if code==17:
                return V[vn]*0.2441/1000;  
+       if code==18:
+               return V[vn]/8.0;
        return 0;