Since these were not distinguished in their fanqie, there was a problem for the rhyme table phonologists as to how to present them.
Rather than attempting a segmental analysis of the finals to complement that of the initials, the rhyme table phonologists classified them and arranged them in tabular form under the initials.
There seems to be a general consensus among phonologists that vowel harmony is an assimilatory process whereby a certain articulatory feature spreads iteratively leftward, rightward, or bidirectionally from one of the vocalic segments in a particular domain -- usually the word -- though certain phonological systems may contain vowels that do not participate in the harmony.
Leaving aside for the moment the question of the source and articulatory characteristics of the vowels in system I as well as the fact that "the vowel [e] occupies a place [in the] two parallel systems" (1969b: 149), let us look at how generative phonologists have reanalyzed Penny's classification.
Phonologists who have since classified Pasiego vowels in terms of features other than [high] and [low] have apparently all resorted to either a [+ tense]/[- tense] opposition (e.
The reason that phonologists have manifested so much interest in Pasiego over the last fifteen years or so is the presence of vowel harmony, or metaphony, as it is often referred to.