I suggest you ...

grouped x-axis

Like Excel does when you use 2 columns for the labels.See example on http://minus.com/mHNwVqDZO.

Each item on the category axis falls in a group. The groups are displayed below the axis items. Each group name is displayed only once (centered below all its items). Groups are devided by longer tickmarks.
Each group can contain a different number of items.
Possible uses:
* display structured categories like product and product group or country and region
* display two or more groups side by side, like gross sales and net sales, or this year and last year.

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    kzoon shared this idea  ·   ·  Flag idea as inappropriate…  ·  Admin →

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