Colour–magnitude diagram of all  ~2000 objects in the 5.5′ ×  5.5′ EFOSC2 field. The vertical line in the top left quadrant separates stars at the distance of HD 155448 from background objects. Letters ABCD denote HD 155448 components (see in the text which assumption was made for the C component). CCDM represents the binary star CCDM J17130−3216AB. GSC denotes GSC-2 S22231309. Sources with B > 21 mag are not displayed.