1. RPC approved plots

2. Plot 1 Y (cm) X (cm) Single gap working region20 40
Plot 1
RPC detector efficiency vs impact point measured extrapolating the DT segment on the RPC chamber. The lower efficiency points in step of 10 x 10 cm2 are due to the dead regions induced by spacers.
The efficiency reduction is more visible for y coordinate around 55 cm where, due to the chamber
construction, the RPC works in single gap.

3. Plot 2
PRELIMINARY
Preliminary maximum efficiency distribution for the RPCs of three wheels of the barrel.
The efficiency is measured extrapolating the DT segment on the RPC plane and looking
at fired strips in a small region around the impact point.
The measurement is repeated at different RPC working voltage and the maximum RPC efficiency
is obtained by a fit to the efficiency vs High Voltage trend.
The tail in the distribution is due to problematic chambers working in single gap mode or affected
by swapped cables in the readout that have been fixed during the shut down.
Systematic effects due to the fact that the distribution is obtained with cosmic muons and not
with collision muons are under investigation, moreover no fiducial regions are selected to remove
the edge of the RPCs.