Abstract. We make some remarks on earlier works on R−bisectoriality in L p of perturbed first order differential operators by Hytönen, McIntosh and Portal. They have shown that this is equivalent to bounded holomorphic functional calculus in L p for p in any open interval when suitable hypotheses are made. Hytönen and McIntosh then showed that R-bisectoriality in L p at one value of p can be extrapolated in a neighborhood of p. We give a different proof of this extrapolation and observe that the first proof has impact on the splitting of the space by the kernel and range.
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