Multipliers-of-self-maps-on-P2: This repository is ancilliary to the paper: A. Guillot and V. Ramírez. On the multipliers at fixed points of self-maps of the projective plane. arXiv: 1902.04433 (2019). This paper is about quadratic endomorphisms on the complex projective plane having an invariant line. We describe the algebraic relations among the multipliers of the fixed points and prove that these multipliers completely determine the linear equivalence class of the endomorphism.