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\section{Description of the data}  This project uses observations by ALMA of 2.6 mm $^12$CO(1-0) $^{12}$CO(1-0)  emission from M83. $^12$CO $^{12}$CO  is used as a tracer of H$_2$ and the size, velocity line width, and luminosity of the GMCs can be found from the data [3]. A CO-to-H$_2$ conversion factor of X$_CO$ = 2 x 1020 K km s$^-1$ s$^{-1}$  cm$^2$ was used to derive the mass of H$_2$ gas. Assuming the clouds are in virial equilibrium, a virial mass was found from the radius and velocity line width [3].