Update README.md

Author: anna-grim

README.md

@@ -36,7 +36,7 @@ We start with a set of ground truth graphs stored as individual SWC files, where
 Note: Misalignments between the ground truth graphs and prediction segmentation are detected and corrected.
 
 <p align="center">
-  <img src="imgs/labeled_graph.png.png" width="400">
+  <img src="imgs/labeled_graph.png" width="700">
   <br>
   <b>Figure:</b> 
 </p>