Illustration of the strangeness-induced charged-particle multiplicity bias effect from \pecrr simulation. (left) \dndetamid distribution in the \inelgz, \VZEROM-(I+II+III) and \VZEROM-XII event classes. Open markers are the corresponding \dndetamid resulting from the additional request of at least 5 \kzero in the event. Continuous and dashed vertical lines show the averages of the unbiased and biased multiplicity distributions, respectively. (right) Relative shift in the \avdndeta for all the different \VZEROM event classes when requiring at least one (full markers) or more than one (open markers) strange particles in the event. Lines are shown to guide the eye.