  In previous work [Adv. Math. 298, pp. 325-368, 2016], the structure of the
simultaneous kernels of Hadamard powers of any positive semidefinite matrix
were described. Key ingredients in the proof included a novel stratification of
the cone of positive semidefinite matrices and a well-known theorem of
Hershkowitz, Neumann, and Schneider, which classifies the Hermitian positive
semidefinite matrices whose entries are $0$ or $1$ in modulus. In this paper,
we show that each of these results extends to a larger class of matrices which
we term $3$-PMP (principal minor positive).
