File:A wafer of germanium is mounted in a cryostat.jpg
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![File:A wafer of germanium is mounted in a cryostat.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/A_wafer_of_germanium_is_mounted_in_a_cryostat.jpg/538px-A_wafer_of_germanium_is_mounted_in_a_cryostat.jpg?20210527072915)
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