cat << EOT > gpl.txt
set terminal png
set output 'fig_ds1.png'
set datafile separator ","
set xrange[0:10]
set yrange[0:2000]
#set xtics 0.1
#set ytics 0.1
#set format x '%2.1f'
#set format y '%2.1f'
set grid
set xlabel 'Delta s'
set ylabel 'Load P (kN)'
set key right top
plot 'dat_999_1.csv' using 6:(-\$1/1000) title 'gamma=1.0' with lines lw 2, \
     'dat_600_1.csv' using 6:(-\$1/1000) title 'gamma=0.6' with lines lw 2, \
     'dat_300_1.csv' using 6:(-\$1/1000) title 'gamma=0.3' with lines lw 2
EOT
gnuplot gpl.txt

cat << EOT > gpl.txt
set terminal png
set output 'fig_ds2.png'
set datafile separator ","
set xrange[0:10]
set yrange[0:2000]
#set xtics 0.1
#set ytics 0.1
#set format x '%2.1f'
#set format y '%2.1f'
set grid
set xlabel 'Delta s'
set ylabel 'Load P (kN)'
set key right top
plot 'dat_999_2.csv' using 6:(-\$1/1000) title 'gamma=1.0' with lines lw 2, \
     'dat_600_2.csv' using 6:(-\$1/1000) title 'gamma=0.6' with lines lw 2, \
     'dat_300_2.csv' using 6:(-\$1/1000) title 'gamma=0.3' with lines lw 2
EOT
gnuplot gpl.txt

cat << EOT > gpl.txt
set terminal png
set output 'fig_ds3.png'
set datafile separator ","
set xrange[0:10]
set yrange[0:2000]
#set xtics 0.1
#set ytics 0.1
#set format x '%2.1f'
#set format y '%2.1f'
set grid
set xlabel 'Delta s'
set ylabel 'Load P (kN)'
set key right top
plot 'dat_999_3.csv' using 6:(-\$1/1000) title 'gamma=1.0' with lines lw 2, \
     'dat_600_3.csv' using 6:(-\$1/1000) title 'gamma=0.6' with lines lw 2, \
     'dat_300_3.csv' using 6:(-\$1/1000) title 'gamma=0.3' with lines lw 2
EOT
gnuplot gpl.txt

cat << EOT > gpl.txt
set terminal png
set output 'fig_ds4.png'
set datafile separator ","
set xrange[0:10]
set yrange[0:2000]
#set xtics 0.1
#set ytics 0.1
#set format x '%2.1f'
#set format y '%2.1f'
set grid
set xlabel 'Delta s'
set ylabel 'Load P (kN)'
set key right top
plot 'dat_999_4.csv' using 6:(-\$1/1000) title 'gamma=1.0' with lines lw 2, \
     'dat_600_4.csv' using 6:(-\$1/1000) title 'gamma=0.6' with lines lw 2, \
     'dat_300_4.csv' using 6:(-\$1/1000) title 'gamma=0.3' with lines lw 2
EOT
gnuplot gpl.txt