"The high vowels /ɨ̝, ɿ, y, ɯ/ can be very fricated", so they're given as fricated vowels here.
/ʅ/ corresponds to Yu's /ɨ̝/, described as "like a syllabic apical alveolar fricative". This has "a slight degree of lip rounding".
Yu's /˥˥˦/ is given here as /˥˦/ for consistency.