How to use Texture Packer properly for Corona

I downloaded Texture Packer (free version) and tested it with the running horse sample code. I tried to use Texture Packer to make a data file for the “uma.png” but the result looks different compare to the original data file in the running horse code. Does anyone know how to use Texture Packer for non-uniform sizes and positions sprite sheet? [import]uid: 38556 topic_id: 15315 reply_id: 315315[/import]