Some other aspects of Californian vowel space that are in progress include the California shift and the centralization of the /ow/ vowel in words like goat and home. The figure below illustrates the distribution of vowels in phonetic space for a small sample of Californian English speakers, by plotting F2 as an analog of the front/back dimension and F1 as an analog of the low/high dimension. Speakers are placed in the same vowel space using log normalization based on Nearey 1978.
In this graph, we can see first that the nucleus of the /uw/ vowel of goose is quite front. But in addition, the short front vowels are each lower than one would expect otherwise in an American English quadrangle: notably, the /ih/ vowel of kit is actually lower than the /ey/ vowel of face. Meanwhile, the /eh/ of dress and /ae/ of trap are similarly lower in the front vowel space. In other words, the relative height distinction between the three vowels is intact, but each has dropped in sequence. Meanwhile, the /ow/ (goat) and /a/ (lot) vowels are central in the front-back dimension: thus, though these speakers have no lot-thought contrast, the lot-thought merger is situated in the low-central vowel space rather than the low-back region.