Angular power spectra of the various systematic effects compared to the Planck temperature anisotropy spectrum. The black dashed curve, representing the total contribution, has been derived from a map where all the systematic effects have been summed. Top panel: power spectra obtained from frequency independent maps resulting from the weighted-average of individual systematic effect frequency maps. Bottom panel: contributions of systematic effects from individual frequency maps. The CMB curve corresponds to the Planck best-fit model presented in Planck Collaboration XV (2014). In the bottom panels the CMB spectrum has been filtered by the beam window function for each frequency.