```
paths: [{
y: 75,
range: Infinity
}]
```

```
paths: [function (x, y) {
return {
y: (75 + 50 * Math.sin(x * 0.04)),
range: Infinity
};
}]
```

```
paths: [function (x, y) {
return {
y: x % 100 < 50? 50: 100,
range: Infinity
};
}]
```