Coronal kinetic energy spectrum (dashed line) and magnetic energy spectrum (solid line) for runs D_cl,   D_1L,   and   D. Wavenumbers are in units of 1/Mm and in the top x-axis the corresponding shell numbers are indicated. The spectra are averaged in time and space and the normalization is in arbitrary units (spectra are also rescaled). The symbols on the E_b spectra indicate the first shell number for which .