Internally, SGV treats taggers as calorimeters, and the data from them
will be in the shower-part at the particle information common-block.
In the analysis code, the taggers can be used by looking for the
existence of a signal in them. The shower start-point will be at
the center of the hit module, and can easily be modified to a module
number. If shower clustering was done, one is assured that there will
only be one cluster per tagger module, even if several tracks went
through the same one. Care should be taken that the measured momentum
etc. of particles only detected by a tagger is not used for total energy
calculation, and the like.