Toy Monte Carlo simulation:
- vertex width sigma = 30 cm
- TAC offset 4000
- TAC resolution 100

Test of reconstruction:
- vertex shifted
- (red) most likely model for vertex distribution (not to be confused with the reconstructed vertex distribution!)
- the model can be used for Gaussian distributions
- any shift of the "trigger data set" from the calibration data needs to be applied on top of the model (also for slewing correction)