TstLim*XDelta

This is a Data Header variable.  

Type = Double

In Limit Tests, TstLim*XDelta indicates the delta X value of the data for which the limit was created.

The '*' in TstLim*XDelta indicates the limit test number, the first limit test being 1 (i.e. TstLim1XDelta, TstLim2XDelta and so on).