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\subsection{GMC properties}  We \citet{Solomon_1987}  examined GMCs in the Milky Way and described a few key relationships that characterize  theGMC  properties as in \citet{Solomon_1987}. of these clouds. We compared these properties for the  M83 clouds The M83 GMCs  exhibit a  similar relationships relationship  for velocity line width $\sigma$  to radius, radius $R$ as the Milky Way GMCs,  which confirms our assumption have a fit  of $\sigma=(\pi^{1/2}R/3.4)^0.5$ kms$^-1$ (Figure 2). This allows us to conclude  the clouds being are  in virial equilibrium (Figure 2). As well, the (\cite{Solomon_1987}. The  virial mass to M$_\mathrm{vir}$ can be calculated from the size and velocity dispersion, while the  luminous mass M$_\mathrm{lum}$ can be calculated from   to luminosity  and X$_\mathrm{CO}$  luminous mass to radius relationships are also consistent with previous findings (Figures 3 and 4).