Medium -to-heavy is 70-75% and Heavy is 80% upwards.
You could always run this past John in an e mail to see if your original idea is do-able... I suppose it might be possible but not being an expert in the actual nitty-gritty of how they tie these things in, I`m trying to visualise how it would look with maybe a `long`line of hair , let`s say running back-to frontand the next line alongside that, being half the length, then the next line long again....and that`s me assuimg that is actually the way they do it.....my guess is it`s not impossible, but probably/possibly something a ventilator might prefer to avoid? I`d be interested to have a definitive answer ! Paul.