Measured (circles) and calculated with RELDIS (solid-line histogram) cross sections of the emission of a given number of neutrons $i$ accompanied by a single proton in UPCs of $^{208}$Pb nuclei at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. Error bars represent combined statistical and systematic uncertainties of the measurements. Dotted-line and dashed-dotted-line histograms present the same cross sections, but calculated with RELDIS for EMD induced by photons with energies in the domain of the quasideuteron absorption and hadron photoproduction on individual nucleons, respectively. Calculated cross sections of the production of specific thallium nuclei, $^{207,206,...,200}$Tl, are presented by the dashed-line histogram marked with the respective nuclide symbols.