-Notion The external program used for forward search call can be specified in
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-forward_search_dvi and
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-forward_search_pdf RC settings. By default, the value for pdf is empty, while for dvi it is
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-"xdvi -sourceposition $$n:$$t $$o"
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-The values replaced in the call: $$n for row number, $$t for exported temporary .tex file, $$o exported output file, either dvi or pdf, depending on which one exists in the temp dir (preferred is dvi).