Alternately, you could try this out.
Click Insert > Diagram > Target Diagram.
Click on the Target Diagram.
The Diagram toolbar should appear.
Click Layout and De-select AutoLayout.
Clcik on the target diagram and select the outer ring.
Pull the "yellow" handle and adjust it so that the ring becomes a circle.
Do this to all the rings.
Now, click Slide Show > Custom Animation.
Click Add Effect > Entrance > Appear/Fade/etc...
Double click on the effect to bring up the Effect Options dialog box.
Click on the Diagram Animation tab.
Click on the Group Diagram dropdown field and select Inward.
Ok your way out.
Does this work for you?
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Site Updated: April 13, 2006
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