Does anybody know where this graph was taken off?

[la.margna]

I'd like to see the rest of that document. Thanks for any links or hints.

 

[gheizhwinder]

The Science of Sport blog used it here:
http://www.sportsscientists.com/2011/03/biological-passport-effective-fight-or.html

(ETA: Source: Zorzoli & Rossi, 2010; Zorzoli 2011)