If we overlay the two graphs normalized to 0 anomaly (with 1999 in blue) they appear to be fairly similar.
But Gavin did a trick. He cooled the baseline temperatures, so that half of the tampering is cooling before 1970, and half is warming after 1970.
The next graph normalizes the two data sets to the years 1995-1997, so we see the full magnitude of the tampering since 1999. Now it becomes clear that Gavin has cooled the past about 0.3C, in addition to all of the data tampering which was already being done in 1999.
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