Polishing.

paper.md

@@ -143,13 +143,12 @@ be applied to different implementations of element shapes and refinement
 patterns. A mix of different element shapes in the same mesh is also
 supported.
 
-![Left: Quad-tree of an exemplary forest mesh consisting of two trees
-($\text{k}_{\text{0}}$, $\text{k}_{\text{1}}$) distributed over three parallel
-processes $\text{p}_{\text{0}}$ to $\text{p}_{\text{2}}$. The SFC is
-represented by a black curve tracing only the finest elements (leafs) of each
-tree. Right: Sketch of the associated mixed shape mesh refined up to level
-three. Bottom left: The elements saved by p1 and the associated ghost  elements
-(non process local neighbors).
+![Left: Quad-tree of an exemplary forest mesh consisting of two trees (k0, k1)
+distributed over three parallel processes p0 to p2. The SFC is represented by a
+black curve tracing only the finest elements (leafs) of each tree. Right:
+Sketch of the associated mixed shape mesh refined up to level three. Bottom
+left: The elements saved by p1 and the associated ghost  elements (non process
+local neighbors).
 \label{fig:SpaceFillingCurves}](pics/t8code_sfc_hybrid.png)
 
 # Performance