That is plotting cigarette tax revenue as a percentage of GDP (vertical axis) against the percentage of the pricer of a packet of cigarettes that is tax (horizontal axis).
Alienware's Area-51 7500 series of desktops can reach some pretty lofty prices, but the folks at Computer Shopper recently got their hands on one of the company's recent, more modestly-priced configurations, and they've awarded it some considerably higher marks than its pricer predecessors.