Table 2: Summarised are the event statistics of the whole SNR and corresponding angular resolutions for the years 2003, 2004, and 2005. The 2004 and 2005 data sets correspond to Data set I of Table 1. The average zenith angle $\langle \phi_{z} \rangle$ is determined from all events reconstructed in the SNR region. For the angular resolution (R68), the 68% containment radius of the simulated gamma-ray point-spread function, matched to the particular data set, is used as figure of merit. The other columns give the number of signal events from the SNR region (ON), the number of background events (OFF), the normalisation factor between ON and OFF counts ($\alpha $), and the corresponding significance and live observation time. $\alpha $ is in general defined as the ratio of the effective exposure integrated in time and angular space of the ON and OFF region. Note that the analysis of the 2003 data is adopted to match the system configuration of this year. The nominal analysis is applied for the 2004 and 2005 data. For 2005, only data recorded at zenith angles less than $60\hbox {$^\circ $ }$ are included (therefore the mean zenith angle decreases). The event statistics are determined with the ON/OFF approach for 2003 and the reflected-region method for 2004 and 2005. In the latter two years, also ON runs with wobble offsets < $0.7\hbox {$^\circ $ }$ (cf. Table 1) are included and hence $\alpha >1$.
\begin{table} \small % \par\begin{tabular*}{\textwidth}{@{\extracolsep{\fill}}c... ...irc$ }$\ & 10277 & 5124 & 1.15 & 33 & 29.7\\ \hline \end{tabular*} \end{table}

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