**Table 1:** Lifetimes in seconds.
		This work		WK69^a
		Experimental^b	Theory
a $\ensuremath{^{3}{\rm {P}}_{0}}$		1.28 $\pm$ 0.13	1.44	1.07
a $\ensuremath{^{3}{\rm {P}}_{1}}$		1.42 $\pm$ 0.22	1.43	1.07
a $\ensuremath{^{3}{\rm {P}}_{2}}$		1.24 $\pm$ 0.04	1.43	1.07

^a Warner & Kirkpatrick (1969).
^b The uncertainty quoted is a one standard deviation of the linear fit to the Stern-Vollmer plot.

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