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Electron efficiency for each mirror - cut in central region

Figure: Long gas cherenkov detector efficiency for each mirror, from a high e run
\includegraphics[bb=20 40 580 700, angle = 0, width=300pt]{rgc-e-eff_3734_mirrorsc.ps}

So the data quality for each mirror can be ordered as: #7$\rightarrow$ #6$\rightarrow$ #9$\rightarrow$ #5$\rightarrow$ #4$\rightarrow$ #10$\rightarrow$ #3$\rightarrow$ #8$\rightarrow$ #2$\rightarrow$ #1. Usually a cut at 230 (right above single photoelectron peak) is used.

Compared to table [*], this is close to the order in number of photoelectrons:

Mirror# $n_{ph.e.}$
7 10.48
6 10.04
4 9.04
9 8.83
5 8.76
3 8.27
10 7.70
8 7.49
2 7.18
1 6.59



Xiaochao Zheng 2001-05-01