The Nf parameter enables range filter functionality.

Unlike a record filter, the Nf parameter does not act as a prefilter. Instead, when used with the Nrs parameter, the resulting record set will be an intersection of the results of the Nf and Nrs parameters. That is, an Nf range filter and an EQL filter together form an AND Boolean request. For more information about range filters, see “Using Range Filters.”

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