The track reconstruction efficiency in TPC sectors
as a function of 
for 3 values of C, was calculated for
the varios pad-row configurations.
Figures 1, 2 and 3
show the results for tdh errors.
The efficiencies obtained with fixed errors can be seen in
Figures 4, 5
and 6.
The momentum resolution is obtained by fitting a gaussian to 
,
where 
is defined as 
for the longest
reconstructed segment of any real track. If the fitted gaussian has
a width larger than the RMS of the distribution, the RMS is used
instead.
Figure 7 shows the 
versus
with tdh errors
for the various pad-row configurations in central Lund AuAu events.
A similar distribution obtained with fixed errors
is depicted in Figure 8.
versus 
in a larger range obtained
with tdh errors is shown in Figure 9.
The results shown were obtained from a sample of events with tracks generated
with a flat distribution in the 
range 0-40 GeV. Similar
results obtained with fixed errors in the tracking code are
displayed in Figure 10.
The cpu time needed on an IBM RISC 6000/370 to reconstruct one TPC sector on a central Lund AuAu event was measured. Figure 11 shows the results as a function of the inner most row used in the tracking with tdh errors. Almost identical results are obtained if fixed errors are used instead. The errors of the plot represent the dispersion on the cpu times.