How to color a small squared or half squared zone of the plot?

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Nisar Ahmed
Nisar Ahmed 2021-12-30
评论： Nisar Ahmed 2022-1-3
Hi, everyone, here it is graph between P vs t, as shown below and the data is also attached here. I want shade a say light blue color in the squre zone having Y axis limit 1865 - 1890. The shade should be in transparent color and plot have to be in stairs and visible within shade zone. How I acn do it, if not complete squared zone, then left half part with same y axis limits should be in colored patch.

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KSSV
KSSV 2021-12-30
B = [23 1865; 36 1865; 36 1890 ; 23 1890] ;
patch(B(:,1),B(:,2),'b') ;
hold on
plot(p,t) ;
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KSSV
KSSV 2022-1-3
编辑：KSSV 2022-1-3
You need to use hold on.
subplot(1,5,2);
B = [20 1865; 40 1865; 40 1890 ; 20 1890];
patch(B(:,1),B(:,2),'b');
hold on
stairs(p,t,'k');
set(gca, 'ydir', 'reverse');
box on

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