Build 3.5.0.40 of xlsgen improves the buil-in chart rendering capabilities. Beginning with this build, the built-in chart rendering draws a line if the chart does not cross the other axis at 0, so the chart is easier to understand. Also, using negative values in data, the automatic min and max values used for the scale are computed differently to better show the actual positive and negative data. All in all, a better layout for the built-in chart rendering, and we expect it to continue to improve over time.