Repeating migration orbital arrangement, 1_1 to 1_2 to 2 to 1_1, three migrating orbiters for some time.   2_1 and 2_2, 1_1 and 1_2...


                Older screens, early state, extending time accumulation frames column and differenced masked frames column,


                Differenced masked frames from early extending time accumulation frames, followed by further time segment frames,