The real part of the sub-spectrum of the MHD continua of a cool solar prominence equilibrium with intermediate gravity g = 0.500 as a function of the radial flux coordinate for axial wavenumber k =  −1 and poloidal mode numbers m =  {−2,...,4} . Temperature is assumed to be a flux function. Crosses are the PHOENIX results, while the colored lines give the four-mode coupling scheme. The colors red, green, blue, and yellow correspond to the dominant , , , and components of the eigenvector.