simulation = {
const simulation = d3.forceSimulation(data)
.force("x", d3.forceX(d => xScale(d.value)).strength(1))
.force("y", d3.forceY(height / 2))
.force("collide", d3.forceCollide(radius + padding))
.stop()
for (let i = 0; i < 120; ++i) {
simulation.tick();
}
return simulation
}