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        *Note: In a multi-species gas the adiabatic index is not a
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        freely selectable parameter but is approximated by the
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        expression*  
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        *γ*=\[5(*n*<sub>*H*</sub>+*n*<sub>*H**e*</sub>+*n*<sub>*e*</sub>)+7*n*<sub>*H*<sub>2</sub></sub>\]/\[3(*n*<sub>*H*</sub>+*n*<sub>*H**e*</sub>+*n*<sub>*e*</sub>)+5*n*<sub>*H*<sub>2</sub></sub>\]
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        *γ*=\[5(*n*<sub>*H*</sub>+*n*<sub>*He*</sub>+*n*<sub>*e*</sub>)+7*n*<sub>*H*<sub>2</sub></sub>\]/\[3(*n*<sub>*H*</sub>+*n*<sub>*He*</sub>+*n*<sub>*e*</sub>)+5*n*<sub>*H*<sub>2</sub></sub>\]
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    -   `_C.polytropic_constant`: polytropic constant in the polytropic
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        EOS.
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