Multiple plots: some refinements

[quote=“marcobonici, post:1, topic:64800”]

How to resolve that alert?

using LaTeXStrings

julia> Plots.plot!(3x, 3y, linewidth = 1, legend = false, fill = (0, 0.5, :red), xticks = round.(range(-3a,stop=3a,length = 3),digits=2), yticks = round.(range(-3b,stop=3b,length = 3),digits=4), xlim=(-4a,4a), ylim=(-4b,4b), color=“red”, ylabel = L"w_a", xlabel = L"w_0")
latex: failed to create a dvi file
latex: failed to create a dvi file
latex: failed to create a dvi file
latex: failed to create a dvi file
latex: failed to create a dvi file
latex: failed to create a dvi file
latex: failed to create a dvi file
latex: failed to create a dvi file