translation of seine twine sizes?

[rdykiel]

I'm sorry for the rookie question but this has been annoying me for a while: what is the correspondence between the sizes for twine seine and the actual width of the twine (e.g. 1/8 inch)? Also, do you have any guidelines regarding proper size selection for lashing applications on a small sailboat (24 ft). E.g. I have been using a "thin" twine for lashing a radar reflector to a 3/16 shroud wire, and a "thicker" one for other things; if I wanted to lash a pinrail to my shrouds which size should I use? Ideally I'd like to carry the minimal set of sizes on my boat where stowage is at a premium, so 2 sizes would be great (thin and thick).

Thanks, and happy New Year!