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function description(description_txt, description_id) {
let lines = description_txt.split("\n")
let title = lines.shift() // first line; and drop it
d3.select("div#"+description_id)
.selectAll("h1")
.data([title])
.enter()
.append("h2")
.text((title) => title)
// drop any blank lines between the title and the body
while (lines.length > 0 && !lines[0]) {
lines.shift()
}
let description = lines.join("\n") // single blob
d3.select("div#"+description_id)
.selectAll("pre")
.data([description])
.enter()
.append("pre")
.text((line) => line)
}
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