Efficiency

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top: electron efficiency and pion rejection factor, vs. cut in spec_l.gas.adc_sum_t, for short gas cherenkov dectector;
bottom:electron efficiency and pion rejection factor, vs. 2D cut in lpr2e and lpr1e, for pion rejector, horizontal axis is in arbitrary unit.

**Figure:** Left arm detector efficiency for a high electron run
$\includegraphics[bb=20 40 580 700, angle = 0, width=300pt]{left-eff_3726.ps}$

The arbitrary unit used for defining 2D cuts in preshowerE and showerE can be understood by figure

**Figure:** 2D cuts in lpr1E and lpr2E for PID analysis
$\includegraphics[bb=20 40 580 700, angle = 0, width=300pt]{left-pr-electron-cut-col_3726.ps}$

Xiaochao Zheng 2001-05-01