Hello Tayyaba,
I understood that you are plotting three plots "Maximum", "Average" and "Minimum" and want to shade the regions between Maximum - Average and Average - Minimum plots.
In MATLAB, the "fill" function provides you the functionality to plot filled polygonal regions as patches with vertices at the (x,y) locations specified by X and Y.
You can implement the fill function like the below example.
% Maximum plot
t = [1 2 3 4 5 6 7 8];
z = nthroot(t, 2.8);
maxPlot = plot(t,z,'d','Markersize',8,'MarkerFaceColor',[0 0.4470 0.7410],'MarkerEdgeColor',[0 0.4470 0.7410]);
% Average plot
hold on
g = [1 2 3 4 5 6 7 8];
h = nthroot(g, 3);
avgPlot = plot(g,h,'d','Markersize',8,'MarkerFaceColor',[0.9290 0.6940 0.1250],'MarkerEdgeColor',[0.9290 0.6940 0.1250]);
% Filling the region between Maximum and Average plot with blue color
fill([g fliplr(t)], [z fliplr(h)], 'b');
% Minimum plot
c = [1 2 3 4 5 6 7 8];
d = nthroot(c, 3.2);
minPlot = plot(c,d,'d','Markersize',8,'MarkerFaceColor',[0.8500 0.3250 0.0980],'MarkerEdgeColor',[0.8500 0.3250 0.0980]);
% Filling the region between Average and Minimum plot with green color
fill([g fliplr(c)], [h fliplr(d)], 'g')
% Adding plots, labels, and text parameters to legend
legend ([maxPlot, avgPlot, minPlot],'Maximum','Average', 'Minimum','FontSize',14, FontName='Arial')
hold off
You can refer to the below documentation to learn more about "fill" in MATLAB
