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

@@ -1457,19 +1457,19 @@ user-defined ambipolar diffusion coefficient. Ambipolar diffusion enters
 the induction equation and energy equation as a field contribution given
 by
 
-**E**<sub>*A**D*</sub> = *η*<sub>*A**D*</sub>/*μ*\[(∇×**B**)×**B**\] × **B**
+**E**<sub>*AD*</sub> = *η*<sub>*AD*</sub>/*μ*\[(∇×**B**)×**B**\] × **B**
 
-where *η*<sub>*A**D*</sub>
+where *η*<sub>*AD*</sub>
 \[`V` ⋅ `m` ⋅ `A`<sup> − 1</sup> ⋅ `T`<sup> − 2</sup>\] denotes the
 ambipolar diffusion coefficient.
 
-*Note: The prefactor* *η*<sub>*A**D*</sub>/*μ* *has units*
+*Note: The prefactor* *η*<sub>*AD*</sub>/*μ* *has units*
 `m`<sup>2</sup> ⋅ `s`<sup> − 1</sup> ⋅ `T`<sup> − 2</sup>.
 
 In the call of `APdiffusionCoeffUser()` function arguments are the
 superblock pointer `g` and the array pointer `APdiff` of type
 `double***` representing the ambipolar diffusion coefficient
-*η*<sub>*A**D*</sub>:
+*η*<sub>*AD*</sub>:
 
       APdiffusionCoeffUser(g,APdiff);