vl.markLine({point: true, opacity: .7, strokeWidth: 3, tooltip: true})
.data(x_parsed)
.encode(
vl.x().fieldN('County').axis({labelAngle: 45}),
vl.y().field('Obesity').bin({step:3}),
vl.size().field('Restaurant_County').count().scale({type: 'log'}).legend({title: 'Restaurants in County'})
)
.render()