The GARCH(1,1) volatility forecast is largely a function of the first term omega, ω = γ*V(L), which itself is the product of a rate of reversion, γ, and a reversion level, V(L); aka, long-run or unconditional variance
David's XLS is here: https://trtl.bz/2yGdnjv
David's XLS is here: https://trtl.bz/2yGdnjv