The Select button in the Boundaries dialog shows the Material Library dialog (if a partition is selected in the list) in which a material can be chosen. Selecting the Use button in the Material Library dialog dismisses that dialog and assigns the material and its name to the selected partition. The assignment is automatic-the Modify button need not be used. Another name, if desired, can be typed in the Name field-the Modify button must be used in this case for the new name to take effect.
The composition fractions and density of a material selected for a partition boundary (or for the edge material) are changed, if necessary, to weight fractions and to a mass density (g cm-3). The fractions are normalized so that their sum is unity.
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