Extracting x;y data points using templex ( Text view)

Hi;

I would like to label and extract the x,y datas point on a curve like peak selection, and any arbitrary point extraction using templex  

can any one show me how to do that in hypergraph?

I have .h3d file openned in hypergraph namely a FRF Displacement/Frequency and i want to calculate Qfactor  ( delta f @ -3db lower location) / (f_peak) for my modes..

thanks in advance..