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\subsection{Gas cell functionality}  The gas cell has been thoroughly tested with multiple elements. Within a wide range of elements, we saw as cell efficiency --  combined stopping and extraction efficiency -- of 10\%$\sim$30\%. Figure~\ref{figStopExtractEff} shows the measured gas cell efficiencies for $^{205}$Fr ($T_{1/2}$=3.8~s), $^{213, 215}$Ac ($T_{1/2}$=738~ms and 170~ms), $^{216}$Th ($T_{1/2}$=26~ms), and $^{217}$Pa ($T_{1_2}$=3.5~ms) as functions  of $\sim$30\%. the degrader thickness.  In the case of the highly chemically active element At, the a combined stopping and extraction  efficiency of $\sim$3\% was seen, although no measurement  was only $\sim$3\%. made as a function of degrader thickness.