       (start - end)/2, 0, 0, ',',
        start < end ? 1 : 0, 50, ',', end] // We always want the arc on top. So if end is before start, putting 0 here turn the arc upside down.
        .join(' ');
    })
    .style("fill", "none")
    .attr("stroke", "black")

})

</script></xmp></code></pre>
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