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Commercial Response: 

Dear Graham,

In Imaris, you can re-slice (XY, ZY, ZX,) the contents of a file by using the:
"Image Processing"-->"Rotate" command.
Then select the axis (X, Y, Z), and the direction.
The direction can be either clockwise or counter clockwise.

For example, if you have a set of XY images,  and you want the stack to now
a series of ZY slices with the "left being on top, you should rotate it
"clockwise" it along the Y axis. 
Clockwise will put the the right side on the "top", Clockwise will put the
left side on the "top".

Once you have rotated the dataset, it should be re saved in the new
orientation for appropriate analysis.

Please let me know if you have any further questions or concerns.
Best Regards,

Arvonn Tully
Technical and Application Support
Western United States
Bitplane, Inc.
http://www.bitplane.com
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