Running mmapsrep gives error

running mmapsrep gives the following error:

% mmapsrep

splot ‘./gs_lines.out’ u (0.5*(2*+)/(++)):(sqrt(3)/2*()/(++$)):frowning:5) t "known gs" w lp pt 4, './fit.out' u (0.5*(2*+)/(++)):(sqrt(3)/2*()/(++)):frowning:5) t "known str" w p pt 1, './newgs.out' u (0.5*(2*+)/(++)):(sqrt(3)/2*()/(++)):frowning:4) t "predicted gs" w p pt 3, './predstr.out' u (0.5*(2*+)/(++)):(sqrt(3)/2*()/(++)):($4) t "predicted" w p pt 0
^
"mapsrep.gnu", line 12: Column number expected

Error running gnuplot or …
You do not have gnuplot installed.
You can download gnuplot from https://www.gnuplot.info/

You need to specify which 3 concentrations you want to plot (column numbers).
Type

mmapsrep -h

for the syntax to use.