<smoothed>true</smoothed> in the graph's settings. Comparing graphs can also be smoothed, you should set: <comparing><smoothed>true</smoothed></comparing> In chart's settings.
Other updates in this version:
Percent sign (%) is added automatically to the Y axis values when comparing data sets and the <recalculate> is set to "true".
Bug fix: when <equal_spacing> was set to "false" and there were multiple graphs with type "column", the columns were displaced incorrectly. This problem was fixed in this version.