(a): Bifurcation diagrams indicating observed behavior of TGF model solutions. Four qualitatively different model solutions are possible: (1) a regime having one stable, time-independent steady-state solution (labelled “Steady state”), (2) a regime having one stable oscillatory solution only, with fundamental frequency f (“1-f LCO”), (3) a regime having one stable oscillatory solution only, with frequency ~2f (“2-f LCO”), and (4) a regime having two possible stable oscillatory solutions, of frequencies ~f and ~2f (“1,2-f LCO”). Reprinted from [11]. (b): Oscillations in SNGFR and TAL tubular fluid CL− concentration and at the macula densa obtained using τ and γ values denoted by the point B3.