I'm honestly at a loss. I've honestly tried using gnuplot and LaTeX together but it never seems to give anything desirable. I have the gnuplot code;
reset
set lmargin at screen 0.2;
set rmargin at screen 0.977;
set tmargin at screen 0.96;
set bmargin at screen 0.13;
# Define colour range to be consistent amongst plots
set cbrange [lowcol:highcol];
set terminal latex
set out 'psi.tex'
set termoption dash
#set title istitle;
set xlabel '$x/a$';
set ylabel '$y/a$' offset 1.7;
set contour;
set view map;
unset surface;
set cntrparam levels 8;
set isosamples 50;
unset key
unset colorbox
splot 'loop_bottom.txt' w l notitle,'loop_top.txt' w l notitle
and the minimal package
\documentclass{article}
\usepackage{graphicx}
\begin{document}
\input{psi.tex}
\end{document}
and I get something that looks like
Which is kind of okay. But the lines are very grainy, I also need the x-axis half the size and "set size 0.5,1" doesn't seem to be working. Unfortunately I can't put the text files that contain the data points on here, but would there be a better (and easily understandable, the deadline for this project is very soon) to be able to plot a monochromatic contour plot of data points in LaTeX, like the one in the picture?