$\mathrm{m}_{1}$ and $\mathrm{m}_{2}$ are the slopes (dP/dT) of the solid - liquid equilibrium lines in the $\mathrm{P}-\mathrm{T}$ phase diagrams of $\mathrm{H}_{2} \mathrm{O}$ and $\mathrm{CO}_{2}$, respectively. For $\mathrm{P}<10 \mathrm{atm}$, the values of $\mathrm{m}_{1}$ and $\mathrm{m}_{2}$ are