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

@@ -425,7 +425,7 @@ individually selected by the user. The standard implementation covers
 criteria which are
 
 -   derivatives-based (most important in practice):
-![amr_deriv](uploads/eaf4cfafa0ef9cb330cad12dfcc95e81/amr_deriv.png)  
+![amr_deriv](uploads/25c608e1a335aca4242b34afb9e4ffeb/amr_deriv.png)  
     $$\\left\[\\alpha\\frac{\|\\delta\\,\\!U\|}{\|U\|+U\_\\mathrm{ref}}+(1-\\alpha)
     \\frac{\|\\delta\\,\\!^2U\|}{\|\\delta\\,\\!U\|+{\\rm FILTER}\\cdot(\|U\|+U\_\\mathrm{ref})}\\right\]
     \\left(\\frac{\\delta\\,\\!x^{(l)}}{\\delta\\,\\!x^{(0)}}\\right)^{\\xi}