> > [2010-11-09 08:34] Vit <email@example.com>:
> >> Is it possible to subtract a straight line (not horizontal) from the
> >> curve on the graph? With out switching to the data table, adding
> >> another column etc...
> I imagine this like putting two point on the graph, plotting line though
> them and subtracting resulting curve (line) from the graph. We use this
> for spectral data analysis, for background subtraction, and now trying to
> replace origin (and sometimes Windows completely on our machines). In
> general operations with curves (summing and subtracting) is very useful
> for visual data analysis. I know it could be done with the columns, but
> when they are located in different tables it's not so simple sometimes.