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There are two ways to link tracks to improve the precision of
track parameter measurements.
The first method is to combine track parameters and their
error matrices obtained by individual tracking devices.
In the second method, we go all way back to
hit points and refit them to a single track
consisting of several track segments.
Apparently the second is more powerful, since it uses all of the
Unlike the first method,
this, however, heavily depends on the nature of the coordinate
information from each tracking divice.
Thus, we will review the first method here.