I have two datasets and I want to emphasize that one of them has smaller “noise level” than the other one. For example:

```
pts1_x = [10randn() for i = 1 : 100]
pts1_y = pts1_x.^2 .+ [100randn() for i = 1:100]
pts2_x = [10randn() for i = 1 : 100]
pts2_y = pts2_x.^2 .+ [25randn() for i = 1:100]
plt = Plots.plot()
Plots.scatter!(pts1_x, pts1_y)
Plots.scatter!(pts2_x, pts2_y)
```

To emphasize that the orange points have a smaller scatter around the parabola, I want to superpose a semi-transparent orange band around them, and a wider semi-transparent blue band around the blue points.

Note that in general, I do not know the law generating the points (i.e., that there is an underlying parabola). I just have two sets of points, one of which has a narrower distribution and I want to emphasize this.

Any suggestions on how to make this more visually obvious? Thanks!