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### Instruction:
How is an IOS XR release version identified in the image or PIE filenames?
### Response:
An IOS XR release version is identified by a numerical suffix value added to the image or PIE filenames. For example, a 3.6.0 suffix identifies an IOS XR mainline release 3.6.0. Mainline releases normally end with a zero as the last decimal number in the suffix.
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