\documentclass{standalone}
\usepackage{xcolor}
\usepackage{tikz}
\newcommand{\op}{\diamond}
\begin{document}
\begin{tikzpicture}
  \fill[color={brown!50}](-20,1.5) rectangle (10.5,6);
  \fill[color={blue!20}](-20,6) rectangle (10.5,13);
  \fill[color={gray!20}](-20,13) rectangle (10.5,18.5);
  \node[anchor=west] at (-19.5,16) {\large\bf Vacuum};
  \node[anchor=west] at (-19.5,12.5) {\large\bf Gas};
  \draw[ultra thick, -{stealth}] (-19.5,12.3) -- (-19.5,6.5);
  \node[anchor=west] at (-19.5,12) {\large\bf $p=0$};
  \node[anchor=west] at (-19.5,9) {\large\bf $p=1/2$};
  \node[anchor=west] at (-19.5,8) {\large\bf $p=2/3$};
  \node[anchor=west] at (-19.5,3) {\large\bf Solid};
  \input{Hasse_low_eqs_data}
\end{tikzpicture}
\end{document}
