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\label{fig:polarization} Polarization Proof of principle for polarization  in collisions around the Z pole energy at LEP, $E_{\rm beam}=$ 44.71 GeV. The measured  transverse polarization of the  two electron  bunches is plotted as function of time, one time. One  of the two electron  bunches was brought into collisions with a positron bunch at 4:10 am, and remained polarized at the same level for more than 5 five  hours afterwards.