troff and tbl vertically spanning rows

[gpatrick]

.TS
allbox,tab(#);
cB cB cB.
component#type#metric
.T&
l l lw(6.5i) .
T{
Kernel
.br
mutex
T}#\^utilization#T{
CONFIG_LOCK_STATS=y, /proc/lock_stat "holdtime-total" / "acquisitions" (also see holdtime-min",
.br
time-max") [8]; dynamic tracing of lock functions or instructions
T}
.T&
l l lw(6.5i) .
T{
Kernel
.br
mutex
T}#\^saturation#T{
With CONFIG_LOCK_STATS=y, /proc/lock_stat "waittime-total" / "contentions" (also see "waittime-min",
.br
profiling(perf record -a -g -F 997 ...,oprofile,dynamic tracing)
T}
.TE

The above code almost works. Except the "type" column with utilization and saturation I want to be vertically spanned, which should be done with \^, however, it is placing it at the top of the two instead of halfway between kernel mutex.

Does anyone know how to accomplish this?