function hover_2(g) {
if ("ontouchstart" in document) g
.on("touchstart", entered)
.on("touchend", left)
else g
.on("mouseenter", entered)
.on("mouseleave", left);
function entered() {
d3.select(this).attr('fill', 'steelblue')
}
function left() {
d3.select(this).attr('fill', 'lightgrey')
}
}