Extended Kato inequalities for conformal operators

We prove, for a class of first order differential operators that contains the Stein-Weiss, Dirac and Penrose twistor operators, a family of Kato inequalities that interpolates between the classical and the refined Kato. For the Hodge-de-Rham operator we get a more detailed result. As a corollary, we get various Kato inequalities from the literature.
Comment: submitted