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Table 5.

Event selection criteria for 3D likelihood analysis.

Source Ψmax Ethr
(deg) (TeV)
Crab nebula 2.0 (a) 0.750–0.825
PKS 2155−304 1.5 0.422–0.619
MSH 15−52 1.5 0.422–0.562
RX J1713.7−3946 1.5 (b) 0.316–0.422

Notes. Ψmax denotes the maximum event offset angle; the last column gives the minimum and maximum applied energy threshold of all observations in the data set.


We use the larger value of 2° for the Crab nebula because two (out of four) observations of this data set have been taken with an offset angle of 1.5° w.r.t. the source position.


The data set for RX J1713.7−3946 contains one observation with a considerably larger offset between the pointing direction and the source w.r.t. the remaining observations. For this observation, the source is not fully enclosed in the selected region. This leads to a slight loss in sensitivity, which we accept here for the sake of a consistent handling of the observations in the analysis.

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