how to use fillbetween?

yo, im trying to get `pw.fill_between` to plot a translucent shaded area with no lines and no label, but i can't seem to massage it correctly...

```
x = np.arange(5)
pw.fill_between(x=x, ylow=x, yhigh=x+10, mode='line', color='000', opacity=0.5, width=0, label=False).show()
```

actually the `opacity` doesn't do anything for me, nor does the `width`, nor the `label`.

any clue?