Spin resonance functions a^ν_U/ν_L(x,p) for the double combinational resonances of the types DC1 – DC4, DC11 and the frequency ratios n:m = 5:4 (black solid line), 4:3 (black dashed line), 3:2 (black dotted line), 5:3 (red solid line), 2:1 (red dashed line), 5:2 (red dotted line), 3:1 (blue solid line), 4:1 (blue dashed line), 5:1 (blue dotted line). The grey lines represent the solutions of the same resonance equations that are relevant for the corresponding types of resonances (DC5−DC8, DC12). The related solutions are separated by the line of marginally stable orbits a_ms(x) (black thick line), they have a common stability point .