\section{Mach number -- density variance relations}
\red{AB: not sure we need this now}
\begin{table}%[]
    \centering
    \begin{tabular}{cccc}
    $b$ & $\mathcal{M}_{\rm rms}$ & forcing & Ref.\\
    \hline\\
    0.5              & $\sim 10$     & mixed       & Padoan et al. (1997)\\
    0.26             & $\sim 6$      & solenoidal  & Kritsuk et al. (2007)\\
    0.07, 0.26, 0.50 & 0.4, 1.4, 4.6 & solenoidal  & Beetz et al. (2008) \\
    1.0              & 1.0           & mixed       & Vasquez-Semadeni (1998) \\
    0.36, 0.43,      & 5.3, 5.6      & solenoidal  & Federrath et al. (2008) \\
    1.05, 0.88, 0.90 & 5.6, 5.7, 5.0 & compressive & -- '' -- \\
    1/3 - 1          & $\sim 5.5$    & mixed       & Federrath et al. (2010\\
    1/3 or 1         & 0.1 -- 15     & sol. or comp. & Konstandin et al. (2012)\\
    \\
    \end{tabular}
\end{table}