Fig. 8
Top: stacked Q/I vs. U/I plot for the TeV (left) and non-TeV (right) samples. Bottom: same for three TeV sources (left) and two non-TeV sources (right) for which we have data over multiple seasons. The stacking is performed by shifting the mass center of each source to the origin. In the bottom panel we stacked the data based on the mass center of all data, which is why the top and bottom panels are not exactly the same for the 2014 data.
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