V$^0$ fits to extract the yield and background for K$^{0}_{S}$ $\to$ $\pi^{-}\pi^{+}$ in p-Pb collisions at $\snn$ = 5.02 TeV. From left to right: no PID selections applied and selecting pions, kaons and protons using a specific PID strategy (here, Bayesian probability $>$ 0.2). The yield estimated from the second plot from the left (compared with the no-PID yield result) gives a measure of the PID efficiency for the pions, while the remaining ones give information about misidentification.