Photometry analysis of the NGC 7241 blue stream. Upper panel: image cutout obtained from the DESI Legacy surveys data with LEGACYPIPE centered in the compact object GC-CAND (indicated by two red lines) embedded in the NGC 7241 stream and classified as a foreground halo star in our study (see Sect. 4.2). The total field of view of this image is 5 × 5 arcmin. The orange square indicates the extent of the figure shown in the bottom panel. Bottom panel: apertures used to perform the photometry of the stream (dashed blue line) and its possible progenitor STREAM-CORE (red circle) are overlapped in a r-band DESI LS image of the stream. The source GC-CAND (black circle between the two red lines) was also masked to derive the results given in Table 2.