Fig. 1

Comparison of water concentrations for different point defects calculated using polarised light and unpolarised light, following the method of Kovacs et al. (2008). Note that the calculated water contents are based only on the principal absorbance bands from each experiment, as discussed in the “Methods” section. Integration ranges are as follows: [Si] 3650–3422 cm⁻¹; [Ti] 3586–3495 cm⁻¹; [triv] 3375–3293 cm⁻¹