You can modify the chart by playing with the root tree.
add the line after declaring root:
```
const dist1 = 120;
root.x = Math.PI / 2;
root.children[0].y = dist1;
root.children[1].y = dist1;
root.children[2].y = dist1;
root.children[3].y = dist1;
root.children[0].x += (Math.PI / 180) * 10;
root.children[0].children[1].x -= (Math.PI / 180) * 10;
```
You can check here https://observablehq.com/d/af2c081735aaca1e