| Sept. 16, 2021, 11:22 a.m. | 
            cvallat (Claire Vallat) | 
            link obs -segments :: [{'added': {}}] | 
        
        
        
            | Oct. 22, 2021, 10:55 a.m. | 
            cvallat (Claire Vallat) | 
            use _OBS for link to observations list :: [{'changed': {'fields': ['Mnemonic', 'Name', 'Description', 'change_reason']}}] | 
        
        
        
            | Oct. 22, 2021, 11:03 a.m. | 
            cvallat (Claire Vallat) | 
            valid for all traj :: [{'changed': {'fields': ['Trajectories', 'change_reason']}}] | 
        
        
        
            | Nov. 30, 2022, 8:41 a.m. | 
            cvallat (Claire Vallat) | 
            added 3GM gravity :: [{'changed': {'fields': ['observation_definitions', 'change_reason']}}] |