They've done studies you know…
Here someone's thesis on the Chans…
https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://pure.uva.nl/ws/files/178521186/Thesis.pdf&ved=2ahUKEwiCob6vzpyTAxXD4skDHY-iD30QFnoECEYQAQ&usg=AOvVaw2fBsJoiwmhLubSeBoGrm22