This is probably due to the fact that the label series is meant to be used by lots of different chart types. What looks good for a stacked column in regards to handling negative values does not look good for the line series.
http://visible.io/charts/line/line-and-dot.html
This is probably due to the fact that the label series is meant to be used by lots of different chart types. What looks good for a stacked column in regards to handling negative values does not look good for the line series. http://visible.io/charts/line/line-and-dot.html