Small logo for README.rst

README.rst

@@ -2,8 +2,7 @@
     :target: http://docs.gprmax.com/en/latest/?badge=latest
     :alt: Documentation Status
 
-.. image:: docs/source/images/gprMax_logo.png
-    :width: 50%
+.. image:: docs/source/images/gprMax_logo_small.png
 
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 Getting Started