m>output</em> data distribution of an
<code>FFTW_FORWARD</code> plan will match the <em>input</em> data distribution
of an <code>FFTW_BACKWARD</code> plan and vice versa; similarly for the
<code>FFTW_MPI_SCRAMBLED_OUT</code> and <code>FFTW_MPI_SCRAMBLED_IN</code> flags.
See <a href="One_002ddimensional-distributions.html#One_002ddimensional-distributions">One-dimensional distributions</a>.
</p>
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