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Cycle 21 Phase II Proposal Instructions
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Chapter 5: Visits, Exposures and Exposure Groups > 5.6 Exposure Number [Exposure_Number]

5.6 Exposure Number [Exposure_Number]
APT will assign a unique integer number to an exposure. The smallest exposure number permitted is 1, and the largest is 999.
Note that exposure numbers for coordinated parallels must (and will be) sequential; see Section 6.3 on page 93.

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