J. Amer. Ceram. Soc., 95  600–606, February 2012. doi: 10.1111/j.1551-2916.2011.05001.x
The caption for Fig. 3 is incorrect and should read:
Fig. 3. Effect of nitrogen substitution for oxygen on Glass Transition Temperature (Tg) for fluorine contents of 0, 1, and 5 equiv% (lines correspond to values calculated using the data in Table III).