+@item chart-files=@var{file-name-template}
+Template for the file names used for charts. The name should contain
+a single @samp{#}, which is replaced by the chart number. Default:
+@file{"pspp-#.png"}.
+
+@item chart-type=@var{type}.
+Type of charts to output. Available types typically include @samp{X},
+@samp{png}, @samp{gif}, @samp{svg}, @samp{ps}, @samp{cgm}, @samp{fig},
+@samp{pcl}, @samp{hpgl}, @samp{regis}, @samp{tek}, and @samp{meta}.
+Default: @samp{png}.
+
+You may specify @samp{none} to disable chart output. Charts are also
+disabled if your installation of PSPP was compiled without
+@code{libplot}.
+