Phase speed diagram of wave modes under photospheric conditions. We use as equilibrium parameters cA,i = 1.3cs,i, cA,e = 0.1cs,i, and cs,e = 1.1cs,i. The external Alfvén speed is not indicated in the graph because no modes with real frequencies appear in that vicinity. The modes with phase speeds between cT,i and cs,i are body modes and the other mode is a surface mode. We only plotted four body modes, while there are infinitely many radial overtones. There are no non-leaky fast modes. The blue circles indicate the location of the observations and the blue triangles are the uncertainty bars.
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