Fix argv handling.
Move ntracks plots; 2v/1v_xy.
2v/1v xy.
Typo
AddDir(0)
svdist2d_comp (norm_below + shift the 1v distribution).
Draw 2v xy dist on top of 1v one.
Rest of svdist2d_comp + run scan over shift.
verbose flag in power fits.
sel_vertex_aft (can change 2v events into 1v ones); min_ntracks(_aft) parameters.
Remove wrep cruft.
1v_ntracks plot sorted by ntracks.
Control the 1v picking with use_f_dz, max_1v_dz, max_1v_ntracks parameters.
Remove prints.