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Relative variations of the unit-cell parameters a/a o (crosses), b/b o (open triangles), c/c o (open circles) and the unit-cell volume V cell/V cell,o (open squares), together with the relative variation of the SoIPMDH dimer volume V dim/V dim,o (closed diamonds), as a function of pressure. The errors in the relative variations of the unit-cell parameters were smaller than the symbol sizes.
