part a

gnuplot> set terminal postscript enhanced color eps size 20cm,15cm
Terminal type set to 'postscript'
Options are 'eps enhanced defaultplex \
   leveldefault color colortext \
   dashed dashlength 1.0 linewidth 1.0 butt noclip \
   palfuncparam 2000,0.003 \
   size 20.00cm, 15.00cm "Helvetica" 14 '
gnuplot> set output 'anac.eps'
gnuplot> set xrange [-1:15.5]
gnuplot> set yrange [0:10]
gnuplot> set xtics 0,2,14 offset 0,-2 font 'Helvetica, 60pt'
gnuplot> set ytics 0,2,10 offset 0,0 font 'Helvetica, 60pt'
gnuplot> set xlabel 'frequency (GHz)' offset 0,-4 font 'Helvetica, 60pt'
gnuplot> set ylabel 'transmission (%)' offset -6,0 font 'Helvetica, 60pt'
gnuplot> set key off
gnuplot> set arrow from -0.93791,0 to -0.93791,10 nohead
gnuplot> set arrow from 0.5,0 to 0.5,10 nohead
gnuplot> plot 'anac0mmpp.txt' u 1:2 w l lt 1 lc rgb 'red' lw 7

part b

gnuplot> set terminal postscript enhanced color eps size 20cm,15cm
Terminal type set to 'postscript'
Options are 'eps enhanced defaultplex \
   leveldefault color colortext \
   dashed dashlength 1.0 linewidth 1.0 butt noclip \
   palfuncparam 2000,0.003 \
   size 20.00cm, 15.00cm "Helvetica" 14 '
gnuplot> set output 'anac2.eps'
gnuplot> unset xrange 
gnuplot> unset yrange
gnuplot> set multiplot
multiplot> set origin 0,0
multiplot> set size 1,0.5
multiplot> set xrange [-0.93791:0.5]
multiplot> set yrange [0:10]
multiplot> set xtics -1,0.3,0.5 offset 0,-2 font 'Helvetica, 50pt'
multiplot> set ytics 0,2,10 offset 0,0 font 'Helvetica, 50pt'
multiplot> set xlabel 'frequency (GHz)' offset 0,-5 font 'Helvetica, 60pt'
multiplot> set ylabel 'trans. (%)' offset -5,0 font 'Helvetica, 60pt'
multiplot> set key off
multiplot> plot 'anac0mmpp.txt' u 1:2 w l lt 1 lc rgb 'black' lw 7
multiplot> set origin 0,0.5
multiplot> set size 1,0.5
multiplot> set xrange [-0.93791:0.5]
multiplot> set yrange [0:10]
multiplot> unset xtics
multiplot> unset xlabel
multiplot> set ytics 0,2,10 offset 0,0 font 'Helvetica, 50pt'
multiplot> set ylabel 'trans. (%)' offset -5,0 font 'Helvetica, 60pt'
multiplot> set key off
multiplot> plot 'anac0mmpp.txt' u 4:3 w l lt 0 lc rgb 'black' lw 12