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My point is you noticed an apparent typo in one of countless reproductions of a famous graph. (I don't believe the image posted is from Mann's work.) What does that tell us about the work the image refers to, or about the science of climate change or anything else other than that whoever reproduced the graph for some website made a typo?
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ugh... only for you.
Feeney, your forgot a third option: They suck at marketing.
I have no idea why they would compress the top half of the graph. Here is another from a different source with the similar results and an uncompressed top half.