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\subsection{GMC properties}  \citet{Solomon_1987} examined GMCs in the Milky Way and described a few key relationships that characterize the properties of these clouds. We derived these properties for the M83 clouds to be confident that they are GMCs.  The M83 GMCs exhibit a similar relationship for velocity line width $\mathrm{\sigma}$ to radius $R$ as the Milky Way GMCs, which have a fit of $\sigma=\left(\frac{\pi^{1/2}R}{3.4}\right)^{0.5}$ kms$^{-1}$ (\ref{fig:rdv}). This allows us to conclude the clouds are in virial equilibrium \cite{Solomon_1987}. The virial mass $M_{vir}$ $M_{\mathrm{vir}}$  can then be calculated from the size and velocity dispersion, while the luminous mass $M_{lum}$ can be calculated from the luminosity and X$_\mathrm{CO}$ \cite{Rosolowsky_2006}. These masses for M83 conform to a 1:1 ratio as expected (\ref{fig:mlummvir}). Finally, the luminous mass to radius relationships are also consistent with previous findings, with \citet{Solomon_1987} finding a fit of $M=540R^2 (M_\odot)$ (\ref{fig:rm}). From this we can infer that the observations in M83 are of GMCs.