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Hi all, Does increasing the number of basis actually increase the accuracy of image registration in SPM and AIR ? I am assuming that most image registration techniques (based on basis function expansion) estimate the lower order coefficients first and estimate the higher order coefficients later. In this sense, variance of the low order coefficients is larger than the variance of the higher order coefficients. Is my logic correct? Any thought on this would be appreciated. -- Moo Chung http://www.stat.wisc.edu/~mchung Assistant Professor Department of Statistics University of Wisconsin-Madison