Typo fix; closes #63

src/12_band_structures_in_higher_dimensions.md

@@ -181,7 +181,7 @@ When transition between two bands becomes possible due to photons having high en
 
 ![](figures/adsorption.svg)
 
-Here $E'_G\approx 0.9eV$ and $E_G\approx 0.8 eV$. The two steps visible steps are due to the special band structure of Ge:
+Here $E'_G\approx 0.9eV$ and $E_G\approx 0.8 eV$. The two visible steps are due to the special band structure of Ge:
 
 ![](figures/direct_indirect.svg)