Low p_T tracking

For global reconstruction the defaults are

GlobalTrackingRegion ( float ptMin = 1., float originRadius = 0.2,
                       float originHalfLength = 15., float originZPos = 0.,
                       bool precise = false );

Generation of hit triplets is in ORCA/src/TrackerReco/TkHitTriplets/src
HitTripletGeneratorFromPairAndLayers.cc
HitTripletGeneratorFromPairAndLayers.h

Sensitive parameters for the extrapolation of the third hit are
float dphi = 0.03;
if (fabs(dist) > 0.025) continue;

-- FerencSikler - 14 Mar 2006