&inputpp
 prefix='graphene',
 outdir='./work/'
 plot_num=0
/
&plot
 iflag=2
 output_format=7
 fileout='charge.dat'
 x0 = 0.0, 0.0, 0.0
 e1 = 2.0, 0.0, 0.0
 e2 = 0.0, 2.0, 0.0
 nx = 100
 ny = 100
/