phonetics-vowel diagram

[zmajche]

Please, help! I looked everywhere and I can't find out how are those lines in a vowel diagram called? The ones that denote closeness and backness of a vowel. Are they called Cardinal lines?

 

[Neillythere]

Try the following reference:

Vowel diagram - Wikipedia, the free encyclopedia

It should help.

Regards

 

[master.english]

;-)Thank you so much.