Template:IPA vowel chart/documentation

Used to display an IPA vowel chart.

The parameters should be vowel specifications (four parameters each) in the following format:
 * IPA of the vowel
 * Openness of the vowel, as a number between 0 (fully closed) to 1 (fully open). A decimal number or fraction can be given.
 * Backness of the vowel, as a number between 0 (fully front) to 1 (fully back). A decimal number or fraction can be given.
 * Degree of roundness, as a number between 0 (unrounded) and 1 (rounded), which are the only currently supported values. Intermediate values can be supported later if needed.