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Shading a delimited area in a contour plot

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Hi,
I am looking for ways which I could shade part of a countour plot with marks. Perhaps the visual cues below could help to understand the problem:
E = 23;
F = 0:0.01:0.3;
K = round(6:0.2:20, 2);
[X, Y] = meshgrid(F, K);
RedFreq = (E * X) ./ Y;
figure;
contourf(X, Y, RedFreq);
% clabel(heatmap);
colormap('sky'); % Set colormap (e.g., 'jet', 'hot', 'cool', etc.)
colorbar; % Display colorbar
xline(0.1, 'Color', 'red', 'LineStyle', '--', 'LineWidth', 1.25);
xline(0.25, 'Color', 'red', 'LineStyle', '--', 'LineWidth', 1.25);
% xregion(0, 0.1, FaceColor="b",EdgeColor=[0.4 0 0.7])
% colorbar; % Display colorbar
grid off
hold off
The result I get is the following:
I would like to achieve the something like this:
That is, the region up to the vertical line in 0.1 would be shaded by these little dotted marks and I would also like to add that region to the legend.

Accepted Answer

Voss
Voss on 9 Nov 2023
Maybe something like this. Adapt as needed.
E = 23;
F = 0:0.01:0.3;
K = round(6:0.2:20, 2);
[X, Y] = meshgrid(F, K);
RedFreq = (E * X) ./ Y;
figure;
contourf(X, Y, RedFreq);
hold on
Npts = 70;
xx = 0.1*rand(1,Npts);
yl = ylim();
yy = yl(1)+(yl(2)-yl(1))*rand(1,Npts);
h = plot(xx,yy,'s','Color',[0.5 0.5 0.5],'MarkerFaceColor',[0.5 0.5 0.5]);
% clabel(heatmap);
colormap('sky'); % Set colormap (e.g., 'jet', 'hot', 'cool', etc.)
colorbar; % Display colorbar
xline(0.1, 'Color', 'red', 'LineStyle', '--', 'LineWidth', 1.25);
xline(0.25, 'Color', 'red', 'LineStyle', '--', 'LineWidth', 1.25);
% xregion(0, 0.1, FaceColor="b",EdgeColor=[0.4 0 0.7])
% colorbar; % Display colorbar
grid off
hold off
legend(h,'Legend')

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