Update README.md

README.md

@@ -35,7 +35,7 @@ where the number is the phase index (starting from 0) and the seconds is the dur
 
 ## Evaluation (Traffic Simulation)
 
-### Performance Metrics Comparison by Model $^{*}$
+### Performance Metrics Comparison by Model *
 
 | Model | Avg Saturation | Avg Queue Length (veh/s) | Avg Throughput (veh/5min) | Avg Response Time (s) |
 |:---:|:---:|:---:|:---:|:---:|