set key below box
set autoscale

line_width = 2
n_lines = $gnuplot_n_lines$

plot_line = 1

if (plot_line != 0) {
    plot for [col=2:n_lines+1] '$gnuplot_dat_filename$' using 1:col with lines title columnheader(col-1) lw line_width
} else {
}

pause -1 "$gnuplot_close_msg$"

reset