set terminal postscript eps color solid 'Times' 26
set output 'example.eps'
set pointsize 1.75
set xlabel "Requests/s"
set ylabel "Replies/s"
set border 31 linewidth 2.5
set xrange [0:100]
set mxtics 4
set yrange [0:100]
set ytics border nomirror
set mytics 2
set size 0.95,0.75
set key  right bottom Right 
plot \
  'input.txt' using 1:2 axes x1y1 title 'line1' with linespoints linewidth 5,\
  'input.txt' using 1:3 axes x1y1 title 'line2' with linespoints linewidth 5,\
  'input.txt' using 1:4 axes x1y1 title 'line3' with linespoints linewidth 5