So the s m masking curve , normally it looks like sort of  I start from  from here , so you   you have uh no noise then you  you  you are expanding the critical band , so the amount of maching is increasing. And when you e hit a certain point , which is a critical band , then the amount of masking is the same.
Mmm.
So that 's the famous experiment of Fletcher , a long time ago. Like that 's where people started thinking " wow this is interesting ! " So.
Yeah.