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### Change Database

Change database will offer you a file dialog where you can select another database file ( `*.odb`). It is possible to have many different substance databases. The default database delivered with GREAT-ER (`substance.odb`) should only be modified/extended if the new values can be trusted (literature/laboratory reference). If you need to work with a large amount of substances, the substance database concept enables you to store substances in different databases by classes. This increases the transparancy of data storage and speeds up data retrieval.