Okay so I just came out of the shower and I'm not sure what my conclusion is. I have examined plenty of productless, dry strands and I had one that was extremely coarse (which came from the underlayer which is straighter than the rest of my hair and also darker because it barely gets any sunlight) and I found that I would not consider the rest necessarily fine, but I also realised that I actually do not know what fine strands look like. I kind of expect them to be almost invisible, which is definitely not the case.
That being said, I think that the overall width of my strands is medium because they do not match those few really coarse strands, yet they are still very clearly visible.
I could take a picture and put it up on here but I'm not sure if anyone would be able to confirm my current observations :-P
F - LP - HD - NE
Fine, low porosity, high density, normal elasticity
Low poo: Burt's Bees Very Volumizing Pomegranate Shampoo
Protein: IAGirl's gelatine treatment
Detangler & LI: KCKT
Beauty Is Not a Number