Three observations per day, standard approach day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D A C B 0 3 fiducial 3 B A D C 0 3 primary 4 C B D D 0 3 secondary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E C B 0 3 fiducial 3 A B D C 0 3 primary 4 E A C D 0 3 secondary 5 E B D E 0 3 secondary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E F B 0 3 fiducial 3 A B C C 0 3 primary 4 D E F D 0 3 secondary 5 A B C E 0 3 secondary 6 D E F F 0 3 tertiary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E F B 0 3 fiducial 3 A B G C 0 3 primary 4 D E C D 0 3 secondary 5 F G D E 0 3 secondary 6 A B C F 0 3 tertiary 7 E F G G 0 3 tertiary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E F B 0 3 fiducial 3 G H C C 0 3 primary 4 A B D D 0 3 secondary 5 E F G E 0 3 secondary 6 H D E F 0 3 secondary 7 A B C G 0 3 tertiary 8 F G H H 0 3 tertiary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E F B 0 3 fiducial 3 G H I C 0 3 primary 4 A B C D 0 3 secondary 5 D E F E 0 3 secondary 6 G H I F 0 3 secondary 7 A B C G 0 3 tertiary 8 D E F H 0 3 tertiary 9 G H I I 0 3 tertiary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E F B 0 3 fiducial 3 G H I C 0 3 primary 4 A B J D 0 3 secondary 5 D E C E 0 3 secondary 6 G H F F 0 3 secondary 7 I J C G 0 3 secondary 8 A B D H 0 3 tertiary 9 E F G I 0 3 tertiary 10 H I J J 0 3 tertiary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E F B 0 3 fiducial 3 G H I C 0 3 primary 4 J K C D 0 3 secondary 5 A B D E 0 3 secondary 6 E F G F 0 3 secondary 7 H I J G 0 3 secondary 8 A B K H 0 3 tertiary 9 D E C I 0 3 tertiary 10 F G H J 0 3 tertiary 11 I J K K 0 3 tertiary . A B day observation sequence source days observed note twice once 1 A B C A 0 3 fiducial 2 D E F B 0 3 fiducial 3 G H I C 0 3 primary 4 J K L D 0 3 secondary 5 A B C E 0 3 secondary 6 D E F F 0 3 secondary 7 G H I G 0 3 secondary 8 J K L H 0 3 secondary 9 A B C I 0 3 tertiary 10 D E F J 0 3 tertiary 11 G H I K 0 3 tertiary 12 J K L L 0 3 tertiary . A B Longer campaigns should use two observations per day instead of three.