How did the PS3 close the gap back to 8m?

[Gilgamesh]

Week starting January 3rd 2009 to Week ending May 9 2009

X360: 3.467 million

PS3: 3.100 million

Total sales on week ending January 3rd 2009

X360: 27.156 million

PS3: 19.463 million

So it was always at around 8 million or less, the X360 was just overtracked before