The tracking performance with various pad-row patterns has been studied. No dramatic differences among them have been found when the vertex is included as a constraint. The vertex inclusion seems to have beneficial effects for reduced pad-row configurations. However information about secondary vertices, which may be very useful for triggering on strangeness, is lost. In addition particle identification with the TOF has been shown to be possible even in the case with only the 16 outer most pad-rows.

**Table 1:** Momentum, Track length and time of flight resolutions
for the different pad-row configurations considered.

**Figure 1:**
Track finding efficiency as a function of for
(a)-(b) full TPC, pad-rows 21-45 and 30-45 with and without vertex
constraint and
(c)-(d) full TPC, even pad-rows and multiple of 3 pad-rows with and without
vertex constraint.

**Figure 2:**
Track finding efficiency as a function of for
(a)-(b) full TPC, pad-rows 21-45 and 30-45 with and without vertex
constraint and
(c)-(d) full TPC, even pad-rows and multiple of 3 pad-rows with and without
vertex constraint.

**Figure 3:**
Momentum resolution as a function of for
(a)-(b) full TPC, pad-rows 21-45 and 30-45 with and without vertex
constraint and
(c)-(d) full TPC, even pad-rows and multiple of 3 pad-rows with and without
vertex constraint.

**Figure 4:**
Momentum resolution as a function of for
(a)-(b) full TPC, pad-rows 21-45 and 30-45 with and without vertex
constraint and
(c)-(d) full TPC, even pad-rows and multiple of 3 pad-rows with and without
vertex constraint.

**Figure 5:**
Track length resolution for
(a)-(b) full TPC, pad-rows 21-45 and 30-45 with and without vertex
constraint and
(c)-(d) full TPC, even pad-rows and multiple of 3 pad-rows with and without
vertex constraint.

**Figure 6:**
Time resolution for
(a)-(b) full TPC, pad-rows 21-45 and 30-45 with and without vertex
constraint and
(c)-(d) full TPC, even pad-rows and multiple of 3 pad-rows with and without
vertex constraint.

**Figure 7:**
Particle mass spectra obtained with the fast tracking and TOF
full TPC, pad-rows 21-45 and 30-45, even pad-rows and third
pad-rows with and without vertex constraint.

Thu Apr 27 10:00:13 EDT 1995