Filling between quantile ranges

Question

Following code plots Quantiles for a GBM process.

ranges = {.01, .05, .25, .5, .75, .95, .99};
Manipulate[
 Plot[
  Quantile[
    GeometricBrownianMotionProcess[μ, σ, 100000][t],ranges],
 {t, 1, 30},PlotRange -> {0, 1500000}], 
{μ, .07, .1}, {σ, .07, .20}]

I would like to shade the area between the ranges

.01 to .05 and .95 to .99 say lt. blue .05 to .25 and .75 to .95 say med. blue .25 to .75 say dark blue with the .5 quantile line thick black

Plot options seems to allow filling between curves using

Filling->{{1}->2} 

syntax but not sure how or if that can be applied here?

Answer 1

Note that your list spec in the Filling suggestion is the other way around. You mean

Filling->{1->{2}} 

With this style you can incorporate the filling style directly there and therefore, what you want can be written down as

ranges = {.01, .05, .25, .5, .75, .95, .99};
col =col = RGBColor[.6, .6, 1];
Manipulate[
 Plot[Evaluate@
   Quantile[
    GeometricBrownianMotionProcess[μ, σ, 100000][t], 
    ranges], {t, 1, 30}, PlotRange -> {0, 1500000}, 
  PlotStyle -> Black, 
  Filling -> {1 -> {{2}, col}, 2 -> {{3}, Darker[col]}, 
              3 -> {{5}, Darker@Darker[col]}, 5 -> {{6}, Darker[col]},
              6 -> {{7}, col}}], 
{μ, .07, .1}, {σ, .07, .20}]

For more functions to plot, you should maybe create this specification automatically.