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how do I adjust the x y intercept?

Hi

Given this curve

https://i.imgur.com/b8ig3Hv.png

How do I make it so that it looks like

https://i.imgur.com/wnLy0w6.png

i.e. so that x and y intersect at x=y=0

also if the only x values that I want to see, are x=0, x=90, x=180

Thanks

Scilab