diff --git a/kalibrierschein.cls b/kalibrierschein.cls
index 5dd97b0ca2c1fa725b2f2ff6abb6ddc09fed31a8..e1b076bfac8499f4a89acd855baf61f938978e30 100644
--- a/kalibrierschein.cls
+++ b/kalibrierschein.cls
@@ -345,7 +345,8 @@ footskip=0bp,
     \extrarowheight=.2ex %
     %\tabcolsep=0pt %
     \sisetup{%
-      print-zero-exponent = false% default
+      print-zero-exponent = false% default 
+      %%%,tight-spacing = true% ???
     }%
     \par\mbox{}\vskip-\baselineskip\the\ks@tab
   \endgroup