An update of the Swarm EFI-TII Gain Correction Map was executed on the three Swarm spacecraft between 13 and 15 December 2023. As a consequence, gaps in EFI-LP data have been observed in the following time windows:

Swarm Alpha and Charlie:

• On 13/12/2023 from 03:20 to 07:20 UTC
• On 14/12/2023 from 03:00 to 06:50 UTC
• On 15/12/2023 from 02:30 to 06:20 UTC

Swarm Bravo:

• On 13/12/2023 from 05:50 to 09:40 UTC
• On 14/12/2023 from 05:30 to 09:30 UTC
• On 15/12/2023 from 05:10 to 09:10 UTC