Why range of diagram is something else while it is looking like 0 to 1?

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Calculate the volume integral of T = xyz2 over the prism in Fig. 1.24

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When I had looked at the picture, I was thinking that range of x is 0 to 1 which is pretty clear from the diagram. Later I noticed they wrote range of x is 0 to 1-y, Why? Is it for the right "curvy plane"?