Correlation functions $R_2^{\rm CI}$ (left) and $P_2^{\rm CI}$ (right) of charged hadrons measured in minimum bias pp collisions at $\sqrt{s} = 13$ TeV. Charged hadrons are selected in the range $0.2 < p_{\rm T} < 2.0$ GeV/$c$ and with pseudorapidity $|\eta|< 0.8$.