Distributions of the Cherenkov angle measured in the HMPID for positive tracks having $p_{\rm{T}}$ between 2.5-2.6 GeV/$c$ (left) and between 3.8-4.0 GeV/$c$ (right), in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5$.02 TeV for the 0-5% V0A multiplicity class (see the text for further details).