Optical spectrum of IRAS 17163, in black, overlaid with the spectrum of IRC+10420 (from Oudmaijer 1998), in red. The line identifications in red were made for the IRC+10420 spectrum by Oudmaijer (1998; with UN indicating an unidentified line, and H hydrogen recombination lines), and have been corrected for a systemic velocity of 75 km s^-1. The Fe II identifications in black have been corrected for a line velocity of 18 km s^-1.