Why not plotting like this (made as .sagews file) ?
(Please note parameters of plot function: [fi,fj], fill, fillcolor)
f1 = 0
f2 = E(l,3500)
f3 = E(l,4000)
f4 = E(l,4500)
f5 = E(l,5000)
f6 = E(l,5500)
a=plot([f1,f2],l,10,1000,fill = {0: [1]}, fillcolor=hue(0.2),
figsize=(3,2),frame=True,rgbcolor=hue(0.2));
b=plot([f2,f3],l,10,1000,fill = {0: [1]}, fillcolor=hue(0.4),
figsize=(3,2),frame=True,rgbcolor=hue(0.4));
d=plot([f3,f4],l,10,1000,fill = {0: [1]}, fillcolor=hue(0.6),
figsize=(3,2),frame=True,rgbcolor=hue(0.6));
j=plot([f4,f5],l,10,1000,fill = {0: [1]}, fillcolor=hue(0.8),
figsize=(3,2),frame=True,rgbcolor=hue(0.8));
m=plot([f5,f6],l,10,1000,fill = {0: [1]}, fillcolor=hue(1.0),
figsize=(3,2),frame=True,rgbcolor=hue(1.0));
O=plot(a+b+d+j+m,**params);O.axes_width(1/4);
O.set_legend_options(font_size='small');
O.set_legend_options(back_color=(0.9,0.9,0.9)) ;
O.set_legend_options(loc=1) ;
O.set_legend_options(shadow=False);
O.set_legend_options(borderaxespad=1);
O.set_legend_options(fancybox=True);
O.axes_color((0.2,0.5,0.5));O.tick_label_color('brown')
O
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