Three-color image of NGC 7538. The wave bands used are SPIRE 250 μm (red), PACS 160 μm (green), and PACS 70 μm (blue). The southern ring structure, as discussed in Fallscheer et al. (2013), can be seen as an almost complete ellipse in the eastern portion of the image, and the fainter, more recently discovered northern ring is also visible. The rings are indicated by dashed white circles in the image. All stars from Table 1 within the field of view are plotted as small green circles. The candidate star BD +61 2408 is indicated by a blue square. The three stars within the northern ring are, from right to left, numbers 66, 67, and 83 in Table 1.