# Fill between two curves

I am attempting to fill the area between two curves. To more clearly illustrate what I am trying to accomplish, I would like to represent the area of the following integral:

```
integrate x-x^2 from 0 to 1
```

I can currently show the area under `x`

with `fill=True`

, but this is not what I want. What I want is for the fill to extend only to `x^2`

rather than all the way down to the x axis.