green except of him
      nodes
        .style('opacity', .2)
      d3.select(this)
        .style('opacity', 1)
      // Highlight the connections
      links
        .style('stroke', function (link_d) { return link_d.source === d.id || link_d.target === d.id ? color(d.grp) : '#b8b8b8';})
        .style('stroke-opacity', function (link_d) { return link_d.source === d.id || link_d.target === d.id ? 1 : .2;})
        .style('stroke-width', function (link_d) { return link_d.source === d.id || link_d.target ==