3-NIRVANA-user-guide/3.1-Code-basics.md

@@ -195,7 +195,7 @@ in that list the next superblock is given by the 'next grid' operator
 The list ends if the next grid pointer is a NULL pointer. The following
 image illustrates the linked list concept.
 
-![linked-list-concept](uploads/7e311eea207cfd20102f732360c219c5/linked-list-concept.png){width=80%}
+![linked-list-concept](uploads/7e311eea207cfd20102f732360c219c5/linked-list-concept.png){width=70%}
 
 Assuming a serial run for the moment, looping over all superblocks `g`
 of mesh refinement level $l$ (index `il`) is as simple as
@@ -405,9 +405,7 @@ individually selected by the user. The standard implementation covers
 the following criteria:
 
 -   derivatives-based (most important in practice):
-
     ![amr_deriv](uploads/25c608e1a335aca4242b34afb9e4ffeb/amr_deriv.png){width=80%} 
-
     The criterion is applied to physical variables $U$
     ($=\{\varrho,\mathbf{m},e,\mathbf{B},C_\mathrm{c}\}$). Undivided
     first ($\delta U$) and second ($\delta^2U$) differences are computed along