How to use Center of Gravity indicator in Kite?


Please explain how to use CoG in Kite. I want the lines to appear on the chart like in the attached image.

you can check complete information about all kite indicators from below link

http://zerodha.com/varsity/chapter/supplementary-notes-1/

Not able to find Center of Gravity. Can you please send me a link specific to Center of Gravity?