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Erm, front or rear? I presume the x axis is degree yaw, y is grams of drag? Is this on a bike or wheel-only? See all the other points about tyre width in previous posts.
hippy-
it's from zipp, so like their other tests: front wheel only, 30mph wind, y = grams of drag.
I found it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=97169&start=30
25 grams of drag (in a test at 30mph) is about 1 watt at 20mph
svenhöek
some test data for zipp 303 and 404 with 23 vs 25 tires: