Inspired by work this summer with Kasper Schmidt (MPIA), I had Price-Whelan and Foreman-Mackey compare spectra from BOSS and SDSS to look for variability. They find enormous variations in the quasars but also in the F-type stars used for calibration! So there is something wrong with the BOSS calibration; we will investigate next week. In the morning, Eyal Kazin (NYU) gave the group meeting, on the baryon acoustic feature.
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