3-NIRVANA-user-guide/3.2-User-interfaces.md

@@ -751,9 +751,8 @@ for the type of coordinate system.
 
         *Note: In a multi-species gas the adiabatic index is not a
         freely selectable parameter but is approximated by the
-        expression*
-
-        *γ*=\[5(*n*<sub>*H*</sub>+*n*<sub>*H**e*</sub>+*n*<sub>*e*</sub>)+7*n*<sub>*H*<sub>2</sub></sub>\]/\[3(*n*<sub>*H*</sub>+*n*<sub>*H**e*</sub>+*n*<sub>*e*</sub>)+5*n*<sub>*H*<sub>2</sub></sub>\]
+        expression*  
+        *γ*=\[5(*n*<sub>*H*</sub>+*n*<sub>*He*</sub>+*n*<sub>*e*</sub>)+7*n*<sub>*H*<sub>2</sub></sub>\]/\[3(*n*<sub>*H*</sub>+*n*<sub>*He*</sub>+*n*<sub>*e*</sub>)+5*n*<sub>*H*<sub>2</sub></sub>\]
 
     -   `_C.polytropic_constant`: polytropic constant in the polytropic
         EOS.