Area of the likely SR of the 16–17 January 2021 CME as seen by STEREO-A/EUVI in the 30.4 nm band at three times around the estimated start of the event. The dashed line represents the solar limb as seen by Solar Orbiter/EUI/FSI, while the cross marks the position of the intercept on the solar surface of the vertical axis of the flux rope estimated via GCS reconstruction (see also Fig. 2).