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IPY Time Frame Fields
The optional Time Frame fields are for specifying a time frame in terms
of days as a constraint on when photographs need to be taken in order to fill
the request. If specified, message(s) will only be sent to the crew during
the time frame in order to get picutures for that period. If only one day is
desired, then fill in the same date in both the start and end periods.
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![NASA Hierarchy](https://webarchive.library.unt.edu/eot2008/20081004164751im_/http://eol.jsc.nasa.gov/images/hierarchy.jpg) |