Phase-plane analysis of the example model displayed in Fig. 5 using the minimal generating set. Projection of the flux cone to input reactions J9 and J12 and biomass output J13. In the regions RI and RVI, there is no biomass production. The regions RII, RIII, RIV, and RV are associated with the generating modes {GM7, GM8}, {GM8, GM2}, {GM2, GM6}, and {GM6, GM5}, respectively.