set output 'E_vs_X.pdf'
set terminal pdf enhanced fontscale 0.75 size 6.0in, 4in
 set xlabel 'horizontal displacement [mm]'
 set ylabel 'Horizontal E-field [MV/m^2]'
set label 'plotting scrips/E\_vs\_X.gnu' at graph 1.02,0.02 rotate left font 'Verdana,8'
plot 'Quad_field_32kV-efield.dat' u 1:($2==0?($3/1.e6):1/0) not