Lindblad diagram of a model galaxy in equilibrium (see galaxy model 04 in Table 1). The z-component of the angular momentum is shown as a function of the specific binding energy for all stellar particles. In red are represented the particles corresponding to the spheroid, while in blue are the stellar particles of the disk. The black dashed line is the J_circ. The top inset shows the edge-on view of the galaxy to which the diagram belongs.