Update README.md

Author: Pwhsky

README.md

@@ -132,7 +132,7 @@ These are examples of how DeepTrack2 can be used on real datasets:
 
     <!-- GH_ONLY_START -->
   <p align="left">
-    <img width="300" src=/assets/MPT-qdots_2.png?raw=true>
+    <img width="300" src=/assets/MPT-qdots_1.png?raw=true>
     <br/>
 
   </p>