Editing VPC plot

How-to
4

@Dawoon did you take a look at this post? NIBR data analysis - #51 by vijay

an excerpt from there

avg_pk_plots = summary_observations_vs_time(ncapop, 
                                  color = :black, linewidth = 2, whiskerwidth = 8,
                                  paginate = true,
                                  limit = 1,
                                  axis = (xlabel = "Time (hours)", 
                                            ylabel = "Concentration (μg/mL)",
                                            yscale=log10, ytickformat=x -> string.(round.(x; digits=1)), 
                                            yticks = [0.1, 1, 10],
                                            ygridwidth = 3, 
                                            yminorgridcolor = :darkgrey,
                                            yminorticksvisible = true,
                                            yminorgridvisible = true,
                                            yminorticks = IntervalsBetween(10),
                                            xminorticksvisible = true,
                                            xminorgridvisible = true,
                                            xminorticks = IntervalsBetween(5),
                                            limits = (nothing, nothing, nothing, 30),
                                            spinewidth = 2),
                                    #facet = ( combinelabels = true,),
                                    figure = (resolution = (800,800),
                                                        fontsize = 22),)