Original example in .md looks like tab separated since its
rendition is ugly, but it is just that -- spaces were not
used, not tabs.

Just so it might come handy (may be there is a command for that)
to display spaces and tabs for content in clipboard you could use
smth like

	$> xsel -o | sed -e 's, ,·,g' -e 's,\t,⇰,g'
	onset·duration⇰response_time⇰correct⇰stop_trial⇰go_trial
	200⇰200⇰0⇰n/a⇰n/a⇰n/a%

More work needs to be done to make it all uniform and factually correct.
In "theory" markdown sources should use tabs.  HTML (and PDF) rendering should
provide nice rendition of those while layouting into a proper tabular presentation
and using some unicode characters to depict tab symbols.

For now -- note should suffice

Co-authored-by: Stefan Appelhoff <stefan.appelhoff@mailbox.org>