I have the following normalized autocorrelation function

Yfrog Image : yfrog.com/0sautocorrelationfunctiong

and I want like to calculate the autocorrelation coefficients where Δχ varies from 0 to 20. I am not sure if the equatin above will provide me with the coefficients directly.

Could you please shed some light in to my topic?

I would like to thank you in advance for your help

Best Regard