Stability domains as a function of ϑ₂ and ϑ₃, indicated by the dark, shaded area, and evaluated using Eqs. (61a) and (64) for different values of |q₁|. Specifically, |q₁| is set equal to 0.1 (left top panel), 1 (middle top panel), 10 (right top panel), 10² (left bottom panel), 10³ (middle bottom panel) and 10⁴ (right bottom panel). The stability domain determined by the stability conditions defined in Dziembowski (1982) is larger and is also indicated in these panels by the hatched areas. Unhatched white areas of the figure panels indicate unstable domains. Note the different axis scales for the different panels, which indicates the importance of the value of |q₁| in determining the stability of stationary solutions.