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We present EXAFS data at the Mn K and Tb L3 edges that provide upper limitson the possible displacements of any atoms in TbMnO3. The displacements must beless than 0.005-0.01A for all atoms which eliminates the possibility ofmoderate distortions (0.02A) with a small c-axis component, but for which thedisplacements in the ab plane average to zero. Assuming the polarization arisesfrom a displacement of the O2 atoms along the c-axis, the measured polarizationthen leads to an O2 displacement that is at least 6X10^{-4}A, well below ourexperimental limit. Thus a combination of the EXAFS and the measured electricalpolarization indicate that the atomic displacements likely lie in the range6X10^{-4} - 5X10^{-3}A.

Limitations on the extent of off-center displacements in TbMnO3 from EXAFS measurements