Automation Tools : Open Sta ( Graph Result)

Sir/Mam

I have very much interested to implement open STA in my company. I have analysed many document related to open sta in opensta.org, but still i am not able to understand Graph reports. Graph Reports which shows so many graphs, so which one i consider to take the exact result.

For example, I have increase the virtual user simoultaneously the Elapsed time also increases according to number of virtual users. So how to i define the correct Elapsed time depends upon the user?

Can you pls send me the documentation which clearly explain the graph reports.

My Email id is

a)kumar@kliotech.com
b)ethikumar@yahoo.co.in

I am waiting for your kind reply.

Regards
kumar