begin{figure*}[tbh]
centering
subfloat[][]{
    includegraphics[width=3.25in]
    {figures/gini.pdf}
  label{fig:gini}
}%
qquad
subfloat[][]{includegraphics[width=3.25in]
{figures/coverage.pdf}
label{fig:coverage}
}%
caption{Trade-off between nDCG and (a) gini and (b) catalog coverage for different $lambda$.}%
label{fig:hist}
end{figure*}

begin{figure*}[tbh]
centering
subfloat[][]{
    includegraphics[width=3.25in]
    {figures/lo.pdf}
  label{fig:lorenzCluster}
}%
qquad
subfloat[][]{includegraphics[width=3.25in]
{figures/lo2.pdf}
label{fig:lorenz}
}%
caption{Lorenz curve for the (a) items recommended from each cluster and (b) total items recommended.}%
label{fig:hist}
end{figure*}