Two column for LaTeX from Pandoc Add twocolumn…

Two column for LaTeX from Pandoc.

Add twocolumn and replace longtable with supertabular.

\documentclass[twocolumn]{article}
...
\usepackage{supertabular}
...
\begin{supertabular}[c]{@{}lll@{}}
...
\end{supertabular}

To make a figure span over two columns, use figure*.

\begin{figure*}[htbp]
...
\end{figure*}