What "normal brain - PTV" dose constraint would you recommend for a large solitary cerebellar metastasis, planning 3 or 5 fraction SRT?

There are two relevant studies that I utilize for relevant planning considerations: HyTEC (which examined data from 51 reports for NCTP modeling for 1-, 3-, and 5-fractions) as well as Upadhyay et al. (which examined outcomes from a high-volume single-institution center where 3 fractions is their in...