Fig. 11
From: A generalized framework for the collinear restricted four-body problem with a central dominant mass
Variation of Π1,2 for the non-collinear libration points with μ0 = 0.55. Both Π1,2 < 0 only within the interval 0.078233 < μ < 0.0897961, implying that the characteristic roots of Eq. (13) are purely imaginary and confirming the linear stability of the non-collinear points in this range.
