I believe Mirages are in the process of being upgraded to MK2, so 4 mirages at a time have less chances. However i could differentiate the airframe of the Lca and Mirage,since it was not flown at an high altitude.
For the first time i saw LCA Tejas flying over Chennai today. i was stunned looking at 4 Tejas roaring in the sky back to back. Sad thing is could not capture in my camera since i never expected them. Any reason why they were here at Chennai ?