Identification of the HgNe (top) and ArXe (bottom) lines. The raw lamp data taken with (left) the multi-slit mask and KP1468 narrow-band filter; (middle) the long slit positioned at centre and KP1468 narrow-band filter; (right) the long slit positioned at centre without filter are shown. The lime boxes mark the same positions on the CCD chip. For HgNe lines, three lines are identified, with their wavelengths noted on the top-left panel. There are no lines strong enough being covered by the KP1468 narrow-band filter for ArXe lines.