Update README.md

Flows/NanGate45/ariane133/README.md

 We implement [Ariane design with 133 macros](../../../Testcases/ariane133) on the [NanGate45](../../../Enablements/NanGate45) platform using the proprietary (commercial) tools **Cadence Genus** (Synthesis) and **Cadence Innovus** (P&R), and the open-source tools **Yosys** (Synthesis) and **OpenROAD** (P&R). 
 
 
-*** Macro Placement Generated by Cadence Flow
+## *Macro Placement Generated by Cadence Flow-1*
 The screenshot of the design using Cadence Flow-1 on Nangate45 enablement is shown below   
 <img src="./screenshots/Ariane133_Innovus.png" alt="ariane133_cadence" width="400"/>  
   
+ ## *Macro Placement Generated by ORFS*
 The screenshot of the design using ORFS on Nangate45 enablement is shown below  
 <img src="./screenshots/Ariane133_ORFS.png" alt="ariane136_orfs" width="400"/>