To plot a broken axes graph like the upper one, there are two methods. We first introduce the one which is simple to understand and a better but a little tricky one will be talked next time. This method uses the "multiplot" mode, plotting the left and right part of the broken axes graph separately. Let us come to see our script. This script just produce the former graph. The explaination of the script is covered as comments of the script and will not be given separately.
reset set term png font "Times,15" set output "broken_axes1.png" f(x)=exp(-x)*sin(500*x) #plotting function set yrange [-1:1] #The later two plot have same yrange set sample 400 set tics nomirror set tmargin at screen 0.9 #the later two plots will share this tmargin set bmargin at screen 0.1 #------------------------------------b------ set multiplot #begin multiplot mode #axes broken line set arrow 1 from screen 0.5,0.08 to screen 0.52,0.12 nohead set arrow 2 from screen 0.52,0.08 to screen 0.54,0.12 nohead set arrow 3 from screen 0.5,0.88 to screen 0.52,0.92 nohead set arrow 4 from screen 0.52,0.88 to screen 0.54,0.92 nohead #x,y axis label and title label set label 1 "Time: t(s)" at screen 0.475,0.025 set label 2 "Signal:U(mV)" at screen 0.025,0.44 rotate by 90 set label 3 center "U=exp(-t)sin(500t)" at screen 0.5,0.95 #The left part set border 1+2+4 #the right border is not plotted set lmargin at screen 0.1 #the left-part's location set rmargin at screen 0.51 set xtics 0,0.02,0.08 plot [0:0.1] f(x) w l lt 1 lw 2 notitle #unset the labels and arrows, otherwise they will be plot #for the second time unset label 1 unset label 2 unset label 3 unset arrow 1 unset arrow 2 unset arrow 3 unset arrow 4 #the right part set border 1+4+8 #the left border is not plotted set lmargin at screen 0.53 #the right-part's location set rmargin at screen 0.94 #ytics is not plotted, as the second plot will share it with the first one unset ytics set xtics 0.9,0.02,1.0 plot [0.9:1] f(x) w l lt 1 lw 2 unset multiplot