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As the above descriptions tacitly suggest, this work was able to show how statistical models go hand-by-hand with non-rigid registration. In this case, they simple evaluated the (non-rigid) registration process and distinguished between the many alternatives offered by different families of warps, similarity measures and so forth. Needless to say, the run-time became a real difficulty when ill-chosen strategies were attempted. Smith took this into consideration in the final evaluation and comparison of all different experiments.