Thanks or this

> When I draw the Cumulative Frequency Diagram and add
>  the interquartile range I only get one of these diagram
> drawn. I want all the 3 diagrams ie the Lower Quartile
> range, the median and the Upper Quartile range.

Yes I agree,and for a future release we plan to implement this. For now you do one at a time - remember to re-select the CFD again so you get the option to put on the next measurement.

> Also when I get one contructed I get a extended line.
> I just want the lines to meet at the graph.

The graph is a curve constructed by a numerical method, so we don't have its equation. Therefore you have to fit the vertical mensurement line by eye. In fact the 'correct' measurments (eg to agree with the box plot) are obtained from setting the CFD to be 'linear'.

Hope this helps.