Wavelength region of echelle order 98 in the slow rotator D15 and the three program stars, offset with respect to one another for clarity. The interactively normalized, radial velocity corrected and rebinned (﹩R=20,000﹩) spectra are shown. The green lines are the same spectra, median filtered with a width of 200 pixels to show the residual run of the continuum. These residuals are mostly confined to ±0.5%.