Resolve the discrepancy between the two reported g_parallel values

Determine whether the measured g_parallel value for the Dy3+:CaWO4 ground doublet is genuinely in conflict with the unpublished value tabulated by Kirton, rather than reflecting systematic error in the undocumented earlier measurement.

Background

The paper compares its accurately measured Dy3+:CaWO4 values, g_parallel = 7.22 ± 0.01 and g_perp = 5.45 ± 0.01, with an earlier unpublished pair of values attributed to Kirton. The reported g_perp values agree, whereas Kirton’s g_parallel exceeds the present value by approximately five quoted standard deviations.

Because the earlier tabulation provides no uncertainty, spectrum, linewidth, or hyperfine constants, the authors cannot determine whether the discrepancy reflects a real difference or the systematic effects associated with an undocumented measurement, particularly the strong lineshape asymmetry for H0 parallel to c.