Measurement of the $e^{+}{e}^{-}\to \mathrm{\Lambda }\bar{\mathrm{\Lambda }}$ cross section from threshold to 3.00 GeV using events with initial-state radiation

Using initial-state radiation events from a total integrated luminosity of 11.957 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector at BEPCII, the cross section for the process $e^{+}{e}^{-}\to \mathrm{\Lambda }\bar{\mathrm{\Lambda }}$ is measured in 16 $\mathrm{\Lambda }\bar{\mathrm{\Lambda }}$ invariant mass intervals from the production threshold up to 3.00 GeV$\mathrm{/}{c}^2$. The results are consistent with previous results from BaBar and BESIII, but with better precision and with narrower $\mathrm{\Lambda }\bar{\mathrm{\Lambda }}$ invariant mass intervals than BaBar.