B-mode gaps (or duplicate numbers) in sounding sequence: (The soundings numbered below exist, gaps are in between), 852637 to 852639 852714 to 852716 853378 to 853380 853562 to 853564 854532 to 854534 854861 to 854863 855043 to 855043 855045 to 855045 855111 to 855113 855139 to 855141 855142 to 855144 855144 to 855146 855164 to 855166 855392 to 855394 855598 to 855600 856828 to 856830 856836 to 856838 856838 to 856840 857056 to 857058 857625 to 857627 858028 to 858030 859608 to 859610 861417 to 861419 861816 to 861818 862032 to 862034 862122 to 862124 863634 to 863636 863636 to 863638 863792 to 863794 864284 to 864286 864640 to 864642 864654 to 864656 864664 to 864666 864678 to 864680 864712 to 864714 864954 to 864956 864956 to 864958 865130 to 865132 866643 to 866645 867371 to 867373 867391 to 867393