If we purchase an interim system it could be re-deployed. However, without knowing how long it would be out of service between uses it is unknown what kind of performance we would get. Also, since it has not yet been determined what will happen at the other plants it seemed that renting would be preferable. Also, we propose doing the interim solution as a demonstration test. We expect it to be successful, but until that data is in we felt more comfortable with a rental option.