Paper:	Merging of Spectral Orders from Fiber Echelle Spectrographs
Volume:	295, Astronomical Data Analysis Software and Systems XII
Page:	415
Authors:	škoda, P.; Hensberge, H.
Abstract:	We review the data reduction of two fiber-based echelle spectrographs (HEROS and FEROS) with emphasis on the similarity of the inconsistencies between the overlap of spectral orders before merging. The literature on echelle data reduction shows that such inconsistencies are commonly observed and usually handled by rather heuristic interactive procedures. For both instruments it seems to be the calibration unit that introduces the bulk of the problem through errors in the flat field. We discuss strategies to treat the problem and to remove the inconsistencies before merging the spectral orders with minimal use of interactive, subjective algorithms.

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