$\langle \pt \rangle$ of $\pi$, K, and p as a function of $\langle {\rm d}N/{\rm d}\eta \rangle$ measured in pp collisions at $\sqrt{s}=7$ and 13 TeV. Open boxes indicate systematic uncertainties, and bars indicate the statistical ones. Colored lines represent the predictions from different tunes of PYTHIA 8 and EPOS4 for pp collisions at $\sqrt{s}=13$ TeV.