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Fig. 2. (a) Fluorine literature data for the glasses VG-A99, VGA-568, VG-2, AC-E, DR-N, GS-N, BCR-2G, and BHVO2-G (Marks et al., 2016; Zhang et al., 2016), compared with F data from the present study. Fluorine concentrations from each study can be found in Tables 2 and 3. The dashed line represents the 1:1 line. Our results are plotted mainly against the data from Zhang et al. (2016), in order to show the good agreement of the individual studies. Glasses VGA-568, VG-A99, and VG-2 show differences that are discussed inside the text and are attributed to glass inhomogeneity. (b) Chlorine literature data for the glasses VG-A99, VGA-568, VG-2, AC-E, DR-N, GS-N, BCR-2G, and BHVO2-G (Marks et al., 2016; Zhang et al., 2016), compared with Cl data from the present study. Chlorine concentrations from each study can be found in Tables 2 and 3. The dashed line represents the 1:1 line. Our results are plotted mainly against the data from Zhang et al. (2016) and show an overall excellent agreement.