# plot parameter for sp400.f
 set xlabel 'Time(sec)'
 set ylabel 'Vs(V)'
#set ylabel 'Coulomb(C)'
#set ylabel 'I(A)'
#set ylabel 'Voltage(V)'
 set grid
 set yrange[-1.5:1.5]
plot \
 'sp400.dat' using 1:2 title 'Vs'               with lines

#'sp400.dat' using 1:2 title 'Vs'               with lines

#'sp400.dat' using 1:3 title 'I'                with lines

#'sp400.dat' using 1:4 title 'Q'                with lines

#'sp400.dat' using 1:2 title 'External Voltage'           , \
#'sp400.dat' using 1:5 title 'High_pass(diff.)' with lines, \
#'sp400.dat' using 1:6 title 'Low_pass(integ.)' with lines