Effect of MANY/ONLY option on track trajectories in G3

Test 1
Single pion thrown with exactly the same kinematics: pT = 0.15 GeV, eta = 0.1.  Energy loss constant, MCS, decay, etc... switched off.

Standard geometry with:
1) IBMO flagged as ONLY (in DEV from xx/xx/xx) -- sold black circles
2) IBMO flagged as MANY (used for QA) -- open red circles

No other changes between run.

Plot each tracking step through the geometry from vertex to outer radius of the TPC.  We see approximately 1 mm shift in the trajectory of the track by the time the