After reading -
(wikipedia) Tandem repeats occur in DNA when a pattern of one or more nucleotides is repeated and the repetitions are directly adjacent to each other.
( a paper) A tandem repeat in DNA is two or more contiguous, approximate copies of a pattern of nucleotides.
I deduced that the portion of oriC containing all four 9mer-s was to be called a tandem repeat and it together with all three 13 mer-s, two tandem repeats.
But again while reading Principles of genetics by Simmons I stumbled upon the following-
The single ori in E.coli has been characterised in considerable detail. It is 245 nucleotide pair long and contains two repeated sequences. One 13-bp is present in three tandem repeats. The three repeats are rich in ...
So here it says that each 9-mer in the series is a tandem repeat actually.
Which meaning is more accepted?