(color online) Intensity distributions of the pulses in panels (a), (c), and (e) spatial time and panels (b), (d), and (f) spatial frequency domains for pulses with different initial energies passing through 1-m-long argon gas-filled HCFs at 500 mbar: (a), (b) 0.1 mJ, (c), (d) 0.2 mJ, and (e), (f) 0.3 mJ.