Decrease the scale of y-axis

I have plotted 2 graphs of y versus t with following commands:

t = linspace(0,10,20);
y = 1./((3/10^(8*8)*7.7*10^58*10^(3/2)*t)/2 + 1/1000).^(2/3);
plot(t,y)
hold on
y5 = 1./((3/10^(8*9)*7.7*10^58*10^(3/2)*t)/2 + 1/1000).^(2/3);
plot(t,y5)

In the attached image, they are blue and red lines, respectively. But I want to scale up the image to observe the clear differences of graph y5 vs t (red one)(i.e. y-axis should be limited from 50 to 100 to see clearer the red graph). So how can I do with that?

[Adam]

doc ylim

Also please learn to format your code using the {} Code block. It is unreadable like that.

[Duong Nguyen]

Thank you for your instruction. I am new to MATLAB so I did not know that. I have put some bracket so that it is easier to read

[Rik]

You misunderstood. When you write or edit something on this website you will see a button with the text {}Code. If you look at your question it is still unreadable. See here for an animated GIF explaining this.