2 questions:

- What is this kind of list called?
- How do I count the amount of points in the list?

This is called a “table”, except a table, as I understand it, is really just composed of lists called, well, “lists”.

It’s exactly the same as if you defined:

```
x_1 = [1,2,3,4,5.06,6]
y_1 = [1,3,2,6,7.23,7]
```

You can use any of the list functions on them, including length(). So

```
length(x_1)
```

would return the length of the list.

That really helped! Thanks!