Our definition (with diagrams): http://www.ceder.net/def/fanthetop.php

To view all formations from which Fan The Top can be used (or at least from all formations discovered so far), do the following:

1. Start CSDS;
2. From the CSDS menu, select 'Snapshot | View a record';
3. From the new screen's menu, select 'Find | Find All';
4. Check the uppermost checkbox only (F1 Exact Call). No other checkboxes should be checked.
5. Enter 'Fan the Top' into the edit box, then press the 'OK' button at the bottom.

This will generate a listing of all possible formations that CSDS knows how to do a fan the top. Since Fan the Top is generally a 4-dancer call, 8-dancer versions of the 4-dancer call are omitted, as they are extrapolated (e.g., you will not find a Tidal Wave Fan The Top). Also, mirror image versions of the call are also omitted, since they too can be extrapolated.

The before and after pictures are shown on the right side, and you can use cursor keys to navigate thru the list.