Data of publication Cavity-enhanced spectroscopy of a few-ion ensemble in Eu3+:Y2O3

Data corresponding to the figures of the publication "Cavity-enhanced spectroscopy of a few-ion ensemble in Eu3+:Y2O3" by B. Casabone et al. (New J. Phys. 20(2018) 095006 https://doi.org/10.1088/1367-2630/aadf68). A text file describes data in each compressed folder, please refer to the caption in the publication for more details.  These data can be also found together with the article manuscript at https://zenodo.org/record/1546139