Update README.md

README.md

@@ -120,7 +120,7 @@ This gain further increases at 7 Billion model size, models trained on GneissWeb
 
 **Figure 12:**  Comparison of Average Eval Scores on High Signal and Extended Eval Tasks at 7B model size.  Scores are averaged over 3 random seeds used for data sampling and are reported along with standard deviations.
 
-<img src="Fig18.jpg" alt="Fig18.jpg" style="width:1000px;"/>
+<img src="Fig18.png" alt="Fig18.png" style="width:1000px;"/>
 
 **Figure 13:** Average evaluation score on High-Signal tasks versus the number of tokens at 7 Billion model size for 350 Billion tokens. The model trained on GneissWeb consistently outperforms the one trained on FineWeb.V1.1 throughout the training.