Before revision:  The heuristic allows us to scrutinize the volatility surface and test  theories of relative tail option mispricing and overpricing usually built on thin tailed models and modification of the Black-Scholes formula  .
After revision:  The heuristic allows us to scrutinize the volatility surface and test various theories of relative tail option mispricing and overpricing usually built on thin tailed models and modification of the Black-Scholes formula .