set terminal png
set output "fig_test2.png"
set xlabel "Period (sec)"
set ylabel "Response spectrum (gal)"
set logscale x
set logscale y
set xrange [0.01:10]
set yrange [1:10000]
set grid xtics ytics mxtics mytics
plot "inp_test2.txt" with line linewidth 2 title "El-Centro"