···5171517151725172<para>
51735173 <link linkend="size-units-on-left">$size_units_on_left</link> will
51745174- display the unit (<quote>K</quote> or <quote>M</quote> to the left
51745174+ display the unit (<quote>K</quote> or <quote>M</quote>) to the left
51755175 of the number, instead of the right if unset.
51765176</para>
51775177···81558155<link linkend="send-multipart-alternative-filter">$send_multipart_alternative_filter</link>
81568156filter script. The composed <literal>text/plain</literal> content
81578157will be piped to the filter script's stdin. The output from the
81588158-filter script should be the generated mime/type of the content, a
81588158+filter script should be the generated mime type of the content, a
81598159blank line, and the content. For example:
81608160</para>
81618161<screen>