EN
Let A be a linear closed one-to-one operator in a complex Banach space X, having dense domain and dense range. If A is of type ω (i.e.the spectrum of A is contained in a sector of angle 2ω, symmetric about the real positive axis, and $||λ(λI - A)^{-1}||$ is bounded outside every larger sector), then A has a bounded $H^{∞}$ functional calculus in the real interpolation spaces between X and the intersection of the domain and the range of the operator itself.