Attempt to reproduce the median EX Lupi spectrum (black line, with standard deviation per pixel marked in grey) by using a rotationally broadened standard veiled by a continuum emission (magenta). The difference between the observed and veiled spectra is shown in pink. A constant veiling cannot reproduce the depths of all lines, even if we only consider a very small wavelength range. The differences are too large to be explained by the standard deviation or time variation observed between the different spectra.