Why did Al Gores famous hockey stick graph disappear from the IPCC's 4th assessment report?

Sort of makes you think what else might disappear in the 5th assessment report?
Update: Bob... that graph looks very different from the first one. Do you think it will change again for the forth assessment report, how can we ever trust this data when it is so obviously exaggerated, manipulated and changed as that is a completely different range?
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