using Gnuplot
empty!(Gnuplot.options.init)
push!( Gnuplot.options.init, linetypes(:Set1_5, lw=1.5, ps=1.5))
function saveas(file; sx=550, sy=350, fs=0.8, term="svg")
    Gnuplot.save(term="$(term) size $(sx),$(sy) fontscale $(fs)", "$(file).svg")
end;

Filled curves

x = LinRange(-10,10,200)
fg(x,μ,σ) = exp.(.-(x.-μ).^2 ./(2σ^2))./(σ*√(2π))
@gp x fg(x, 0.25, 1.5) "w filledcurves lc '#E69F00' t '0.25,1.5'"
@gp :- "set style fill transparent solid 0.5 noborder"
@gp :- "set key title 'μ,σ' box 3" xlab = "x" ylab = "P(x)"
@gp :- x fg(x, 2, 1) "w filledcu lc rgb '#56B4E9' t '2,1' fs transparent solid 0.25"
@gp :- x fg(x, -1, 2) "w filledcu lc '#009E73' t '-1,2' fs transparent solid 0.1"
saveas("filled001");