Phase speed diagram of wave modes under photospheric conditions. We have taken c_A,i = 2c_s,i, c_A,e = 0.5c_s,i, and c_s,e = 1.5c_s,i. The Alfvén speeds are 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 modes are surface modes. We note that we only plotted two body modes, while there are infinitely many radial overtones.