{
for (const dy of [.3, .4, .5, .6]) {
const y = dy * height
svg.append('path')
.attr('d', `M0,${height} L0,${y} ${[...points(50, y, 50)].map(([x,y]) => `L${x * width},${y}`).join(' ')} L${width},${height} Z`)
.attr('fill', 'tomato')
.attr('opacity', .3)
}
return svg.node()
}