2494 20160701171706.0 ASTROimport-651 de Cuyper, J.-P. 2002 Improving the Rectification of Echelle Spectra We discuss how to improve the rectification of echelle spectra, based on tests done with a stable, fiber-fed spectrograph. Minor differences in the light path induce changes of the blaze function. However, these changes are almost independent of the spectral order when expressed in the proper coordinate. Additionally, we show how to avoid signatures of bad columns, insofar they are due to changes in the light path. Hensberge, H. Astronomical Data Analysis Software and Systems XI 281 2002 324 http://esoads.eso.org/abs/2002ASPC..281..324D published in NONREF