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

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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.

Accepted Answer

KSSV on 30 Dec 2021
B = [23 1865; 36 1865; 36 1890 ; 23 1890] ;
patch(B(:,1),B(:,2),'b') ;
hold on
plot(p,t) ;

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