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