Hi Csilla, thanks for the reply, that is the sort of thing I am looking for. But I’m not seeing that result from looking at . It seems to always be negative. The only consistent sign change I can see between right and left sides is at  – it is always zero for labels on the right, and always non-zero for the left. But unfortunately, the non-zero values are extremely tiny (e-16 or 17!) and it seems strange to evaluate for such a difference with zero. Or, should I go ahead and do
IF ABS(connectionSide-0)<0.000000000000000001 THEN... Thanks again.