git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@751
a5681a0c-68f1-0310-ab6d-
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I<xff> The xfiles factor defines what part of a consolidation interval may
be made up from I<*UNKNOWN*> data while the consolidated value is still
-regarded as known.
+regarded as known. It is given as the ratio of allowed I<*UNKNOWN*> PDPs
+to the number of PDPs in the interval. Thus, it ranges from 0 to 1 (exclusive).
+
I<steps> defines how many of these I<primary data points> are used to build
a I<consolidated data point> which then goes into the archive.