  We present a new approach to take into account resonance decays in the
blast-wave model fits of identified hadron spectra. Thanks to pre-calculated
decayed particle spectra, we are able to extract, in a matter of seconds, the
multiplicity dependence of the single freeze-out temperature $T_{\rm fo}$,
average fluid velocity $\left<\beta_{\rm T}\right>$, velocity exponent $n$, and
the volume $dV/dy$ of an expanding fireball. In contrast to blast-wave fits
without resonance feed-down, our approach results in a freeze-out temperature
of $T_{\rm fo}\approx 150\,\text{MeV}$, which has only weak dependence on
multiplicity and collision system. Finally, we discuss separate chemical and
kinetic freeze-outs separated by partial chemical equilibrium.
