Activate and test
\family typewriter
preview
-\family default
-
-\begin_inset Separator latexpar
-\end_inset
-
-
\end_layout
\begin_deeper
-pic
\family typewriter
:
-\family default
-
-\begin_inset Separator latexpar
-\end_inset
-
-
\end_layout
\begin_deeper
\backslash
ar@{^(->}[r].
-\family default
-
-\begin_inset Separator latexpar
-\end_inset
-
-
\end_layout
\begin_layout Standard
with double, triple shaft or arrows showing only the lower or upper half
of their tips and ends.
Arrows need not have tips nor ends, as the last example shows:
-\begin_inset Separator latexpar
-\end_inset
-
-
\end_layout
\begin_layout Standard
Preamble
\family default
):
-\begin_inset Separator latexpar
-\end_inset
-
-
\end_layout
\begin_deeper