\label{fig:lumi}
The target luminosities at the FCC-ee, as a function of the centre-of-mass energy: red (baseline beam crossing) and purple (crabbed-waist beam crossing) lines. The plot also indicates the target luminosities of of other ${\rm e^+ e^-}$ colliders under study in the world. Figure taken from the FCC-ee official web site~\cite{FCCeeWebSite}.