Adjust image heights for visual size similarity

README.md

@@ -256,11 +256,20 @@ or [create an issue](https://github.com/trixi-framework/Trixi.jl/issues/new).
 
 ## Acknowledgments
 <p float="left">
-  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231436391-b28a76a4-f027-40f9-bd28-14e3a2f3e16a.png" height="92"/>
-  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231429826-31fd7e78-19b4-4bac-8d4c-d292c6570d93.jpg" height="92"/>
-  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231433851-97dd9d3e-4f66-4a8c-a4ee-aca262a2e505.png" height="92"/>
-  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231434670-64b3644f-9860-4139-a54d-13b538711e1b.jpg" height="92"/>
-  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231508947-e3d119c8-bafb-472c-b6fb-18eda2009a55.jpg" height="92"/>
+  <!-- BMBF -->
+  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231436391-b28a76a4-f027-40f9-bd28-14e3a2f3e16a.png" height="110"/>
+
+  <!-- DFG -->
+  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231429826-31fd7e78-19b4-4bac-8d4c-d292c6570d93.jpg" height="100"/>
+
+  <!-- SRC -->
+  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231433851-97dd9d3e-4f66-4a8c-a4ee-aca262a2e505.png" height="70"/>
+
+  <!-- ERC -->
+  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231434670-64b3644f-9860-4139-a54d-13b538711e1b.jpg" height="100"/>
+
+  <!-- NSF -->
+  <img align="middle" src="https://user-images.githubusercontent.com/3637659/231508947-e3d119c8-bafb-472c-b6fb-18eda2009a55.jpg" height="80"/>
 </p>
 
 This project has benefited from funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)