Phase speed diagram of wave modes under photospheric conditions. We use as equilibrium parameters c_A,i = 1.3c_s,i, c_A,e = 0.1c_s,i, and c_s,e = 1.1c_s,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 c_T,i and c_s,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.