Source google image: https://www.researchgate.net/profile/Roberta_Volpe/publication/50894626/figure/fig23/AS:669467428274176@1536624881134/Definition-of-the-Tau-isolation-annulus-63.png
Isolation 63
Source google image: https://www.researchgate.net/profile/Roberta_Volpe/publication/50894626/figure/fig23/AS:669467428274176@1536624881134/Definition-of-the-Tau-isolation-annulus-63.png