Fig. 9
From: A generalized framework for the collinear restricted four-body problem with a central dominant mass
Variation of the characteristic roots Λ1,2 for the libration point L2 with μ0 = 0.75. For 0 < μ < μ∗ = 0.04480, both Λ1 and Λ2 are negative, yielding purely imaginary eigenvalues of the characteristic Eq. (14) and indicating that L2 behaves as a center and is linearly stable.
