de
  const newNodeMap = new Map(newNodes.map(n => [n.id, n]))
  newNodes.forEach(n => { n.currentLinkCount = 0 })
  newLinks.forEach(l => {
    newNodeMap.get(l.source).currentLinkCount++
    newNodeMap.get(l.target).currentLinkCount++
  })

  // Chronology
  if (chronology) {
    nodes.forEach(chronologyConstraint)
  } else {
    nodes.forEach(d => { d.fx = null }) // Remove constraint
  }
  svg.selectAll('.chronology-axis').attr('visibility', chronology ? null : 'hidden')

  // Stat
  d3.select('#stat').t