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Maximum: CRVALn + CDELTn*(NAXISn - CRPIXn)

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For the Frequency axis, which only has a single point (NAXISn=1), our calculations are simpler:

Minimum:  CRVALn - CDELTn/2

Center :     CRVALn

Maximum: CRVALn +CDELTn/2

Image Sets Database Table:

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