Resource at https://figshare.com/
https://figshare.com/projects/Tunable_Isolated_Attosecond_X-ray_Pulses_with_Gigawatt_Peak_Power_from_a_Free-Electron_Laser/65741
https://figshare.com/projects/Tunable_Isolated_Attosecond_X-ray_Pulses_with_Gigawatt_Peak_Power_from_a_Free-Electron_Laser/65741