Comparison between coronal hole boundaries derived from open magnetic field lines (cyan) and synthetic EUV emissions (magenta). The left panel corresponds to the WP-AW simulation without the far-side AR (February 15), while the right panel corresponds to the WP-AW simulation with the far-side AR (February 22). Contours of the coronal holes extracted from the background SDO/AIA 193 Å EUV synoptic map are shown in white. We also indicate the longitude corresponding to the AR on the far-side with a red line, and the longitude corresponding to the central meridian as seen from the Earth with a green line. The comparison is made with CR2240.