Angled text in CFChart for x-axis items

I'd like to angle the labels - say 45°. Horizontal "disappears" or overlaps - neither being acceptable, while "Vertical" is hard to read and takes more space.

I have found "Horizontal" and "Vertical" work in the xml call style="myStyle" in CF10 and earlier, style="myStyle.xml" in CF 11, which references

CFexe/cfusion/charting/styles/[myStyle].xml

...

-<xAxis>

<labelStyle orientation="Vertical" isHideOverlapped="true"/>

<titleStyle isMultiline="false" font="Arial-12-bold"/>

</xAxis>

...

If I put a numeric in the orientation value assignment CF errors.