See through effect question

[Overthinker]

I wanted for surgeons and people who have done research on this to answer this question if possible. 
 

I know it depends on hair characteristics for each individual and mostly it requires two procedures to achieve it , but what what is the average limit of density that the see through effect does not longer exist after hair transplant ? I heard somewhere is a little above 60 grafts per square , is it true ? 

[Curious25]

1 minute ago, Overthinker said:

I know it depends on hair characteristics for each individual

You've already answered your question here 😊

[Overthinker]

Just now, Curious25 said:

You've already answered your question here 😊

True but even someone with thick hair places 40 grafts per cm there’s going to be some see through effect.  That’s why I’m writing average 😂

[Curious25]

You're asking how longs a piece of a string. 

For some people, 40 grafts per cm2 will prevent the see through effect, for others, perhaps not. 

Hair characteristics my friend.