Thank you for your reply!
However,
(1) Can we avoid Plots.jl and use GR.jl only? See my original post for why I want to avoid Plots.jl.
(2) Even if I accept the use of Plots.jl with GR backend, a simplified copy of the example only generates plot one after another, with the latter overwriting the previous. Yes by saving each plot as picture one can always open all of them, but what I am looking for is for all plots to display simultaneously in different graph windows. (And yes I don’t use graph panes; rather I prefer individual plot windows just like what Matlab and matplotlib would do.)
Is this even possible in GR.jl by itself without using Plots.jl?