SED of IRAS 18276−1431 (squares) and the bright field star FS1 (circles; see Fig. 2). Data from this paper are plotted using filled symbols. Literature data points are represented by open squares (from the 2MASS and IRAS databases; Le Bertre 1987; van der Veen et al. 1995; Meixner et al. 1999). Crossed out symbols represent photometric data obtained with large apertures most likely including flux from FS1 and that overestimate the flux from IRAS 18276−1431. A solid (dashed) line has been used to delineate the SED of IRAS 18276−1431 (FS1) in the 0.6–3.8 μm range.