Table 1
Experimental ratios (r/a) for the different combinations of proton fluence and applied current density (J)
Fluence (proton/cm)	J(mA/cm2)
	3	30	300
5e10	0.237	0.295	0.381
8e10	0.213	0.267	0.356
1e11	0.192	0.240	0.308

Recio-Sánchez et al. Nanoscale Research Letters 2012 7:449   doi:10.1186/1556-276X-7-449