\begin{figure}
  \begin{tikzpicture}[>=latex]

  \fill[color=i6colorscheme2,rounded corners]
    (-15,-1) rectangle (-7,1);
  \fill[color=i6colorscheme3,rounded corners]
    ( -4,-1) rectangle ( 4,1);
  \fill[color=i6colorscheme4,rounded corners]
    (  7,-1) rectangle (15,1);

  \node at (-11,0) {Level 0};
  \node at (  0,0) {Level 1};
  \node at ( 11,0) {Level 2};

  \shade[left color=white,right color=i6colorscheme4]
    (-18,-3) -- (13,-3) -- (13,-2) -- (18,-4.5) --
    ( 13,-7) -- (13,-6) -- (-18,-6);

  \node at (0,-4.5) {%
      \begin{minipage}[c]{20cm}
        \footnotesize
        \centering
        Quantity of machine-readable data \\
        Reproducibility
      \end{minipage}
    };

  \end{tikzpicture}
\end{figure}
\begin{itemize}
  \item Software for converting calculation output files to CIF:
    \begin{itemize}
      \item AiiDA (\url{http://www.aiida.net}) -- level 0, is being extended to 2
      \item vasp2cif (\url{http://github.com/egplar/vasp2cif}) -- level 0
    \end{itemize}
\end{itemize}
\vskip -0.5cm
