The best fit model SED of NGC 891, corresponding to , SFR = 2.88 M_⊙/yr, F = 0.41, together with the observed data in the MIR/FIR/submm (plotted as rhombus symbols with error bars). The observed flux densities and the corresponding references are given in Table 1. The calculated total intrinsic stellar SED is plotted as black line and rhombus symbols. The predicted stellar SED given by population synthesis models is plotted as dark blue line. The intrinsic stellar SED of the young stellar population in the diffuse component (the fraction 1 − F escaping the star-forming complexes) is plotted with mauve line. The intrinsic SED (only diffuse) of the old stellar population, as derived from the optimisation of the optical/NIR images of NGC891, is plotted with light blue line. The corresponding SED for the bulge is plotted with pink line. The different symbols overplotted on the UV/optical SEDs indicate the wavelength at which the radiative transfer calculations were performed. The predicted PAH and dust emission SED is given with red line. Also plotted are the two main components of infrared emission: the predicted diffuse SED (dark-green line) and the predicted clumpy component associated with the star-forming regions (light-green line).