... UMRAO

University of Michigan Radio Astronomy Observatory; see http://www.astro.lsa.umich.edu/obs/radiotel/umrao.html

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... package

The PERIOD software package is provided by the Starlink Project which was run by CCLRC on behalf of PPARC. See http://star-www.rl.ac.uk

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... process

Only the assumption of a white noise process would allow a simple significance threshold parallel to the frequency axis to be placed. Admitting a red noise process would require us to consider a range of possible power laws for the process, which would lead to a range of significance areas (not parallel to the frequency axis). Note, that the formal L-S false-alarm-probability lies below 1% (with 95% confidence) for all major peaks in Fig. 2.

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