Conformity signal in TNG300 at z = 0 (left), z ∼ 0.3 (middle), and z ∼ 1 (right). The upper panels show the mean quenched fraction of secondary galaxies for both quenched (red) and star-forming (blue) primary galaxies before (solid lines) and after (dashed lines) removing former satellites. The bottom panels show how the conformity signal varies before (black solid line) and after (gray dashed line) removing former satellites, until 10 h⁻¹ Mpc distances from primary galaxies.