$usedvprofile

$usedvprofile par%dvfile xmin , xmax , position_offset_from_ddcc_to_MC

unit (cm, V/cm, cm/s ) for position, Electric field and velocity

dVfile format is

N
X1  E1  vel_1
X2  E2  vel_2
X3  E3  vel_3
X4  E4  vel_4
....

For example, MC runs 20nm. from 0 to 20nm, DDCC's channel region is 21.0nm to 41nm. So the command is 

$usedvprofile
dvMCfilename
21.0e-7  41.0e-7  21.0e-7 

dvMCfilename file's content is

 201
 0.0e-7  100.0  1.0e6
 0.1e-7 100.0  1.2e6 
 0.2e-7
 ...
 ...
 20.0e-7