n be traced back to 
a gluon splitting are treated in close analogy with the gluon case. 
Quark lines that attach directly to the beam remnants cannot be merged 
but are left behind. 

<p/>
The joining procedure can be viewed as a more sophisticated variant of 
the one introduced already in [<a href="Bibliography.html" target="page">Sjo87</a>]. Clearly it is ad hoc. 
It hopefully captures some elements of truth. The lower <i>pT</i> scale 
a system has the larger its spatial extent and therefore the larger i