Smoothing of fixel data is performed based on the sparse fixel-fixel
connectivity matrix::
fixelfilter fd smooth fd_smooth -matrix matrix/
fixelfilter log_fc smooth log_fc_smooth -matrix matrix/
fixelfilter fdc smooth fdc_smooth -matrix matrix/
By calling the :ref:`fixelfilter` command on each fixel directory in turn,
the smoothing filter will be appplied to all fixel data files present in
each of those directories; it is not necessary to call the :ref:`fixelfilter`
command separately for each individual fixel data file.
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