... mass

We use a spherical definition of the Jeans mass, $M_{\rm J} \equiv 4/3~\pi \rho \lambda_{\rm J}^3$, with density $\rho$ and Jeans length $\lambda_{\rm J}\equiv \left(\frac{\pi{\cal R}T }{G \rho}\right)^{1/2}$ and where G and $\cal R$ are the gravitational and the gas constant. The mean Jeans mass $\langle M_{\rm J} \rangle$ is then determined from the average density in the system $\langle \rho \rangle$.

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