We have several paths we would like to pursue soon. As mentioned above, we are trying to find a way to fine tune the combined preconditioning plus regularization scheme. Currently we are getting satisfactory results from carrying out more iterations of the preconditioned inversion than the regularized inversion, but we hope to find a way to determine the best combination. Additionally, it is not necessary to apply the preconditioning or regularization everywhere. Therefore we are working on a way to limit the effects of the preconditioning to a user-defined area. Another step that should be fairly straightforward is applying the entire process to 3-D data.