Spike map

<Plot projection="albers-usa" length={{ range: [0, 100] }}>
    <Geo
        data={[nation]}
        fill="var(--svelteplot-bg)"
        stroke="currentColor" />
    <Geo
        data={[stateMesh]}
        stroke="currentColor"
        strokeWidth={0.5} />
    <Spike
        {...geoCentroid({
            data: counties
        })}
        stroke="var(--svp-green)"
        length={(d) => d.properties?.votes ?? 0} />
</Plot>