Cepheus A region as seen in channel 1 of Spitzer/IRAC at 3.6 μm (background colours; retrieved from the Spitzer archive; wedge units are MJy/sr), and in H₂ at 2.12 μm (in dark grey contours, from Cunningham et al. 2009). The observed position “Cep A HW2” is marked by a black hexagon, surrounded by the GREAT beam sizes in CO (16–15) (roughly the same as in OH 1835 GHz and 1838 GHz) and OH 2514 GHz (respectively 16.̋3 and 11.̋9). Multiple OH maser spots have been found in the vicinity of this source by Cohen et al. (1984) and Bartkiewicz et al. (2005). The off positions are also indicated by white and red hexagons in the north-eastern and south-western directions with respect to the observed position.