Twelve bands of the N 2+B2Σ u+- X2Σ g+ system, including vB = 0-6 and vX = 0-8, are reanalyzed. All effects of B2Σ u+ ∼ A2Π u perturbations are explicitly considered. Despite the use of high precision (0.01 cm -1) line measurements, no evidence for a perturber other than A2Π u is obtained. Deperturbed constants for the B2Σ u+ and X2Σ g+ states are derived. The deperturbation is shown to be self-consistent and complete (excluding effects of the C2Σ u+ state) by examining semiempirical relationships of the perturbation matrix elements with the spin-rotation constants of the B and X states and atomic spin-orbit parameters. A number of previous analyses of transitions involving the vB = 3 and 5 levels are found to be incorrect.