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The phrase "a spans" is not correct in written English.
It appears to be a grammatical error, as "spans" is a plural noun and should not be preceded by the article "a."
Example: "The bridge has a span of 100 feet."
Alternatives: "a range" or "a stretch".
Exact(7)
(The unmigrated airborne profile in Fig. 1c is unsuitable for this purpose). Radar profile A1 A1′ (Figs 4 and 5) shows that reflector A spans 330 m across the ice flow.
Our result shows that when the set A spans a non-expansive linear subspace of a normed space, the Torricellian point(s) exists.
The second cluster starts 2108 bp upstream of exon A, spans 1892 bp and contains 10 putative cis-elements.
Primer set A spans the entire coding region of exon 9 (496 bp), and primer set B amplifies 681 bp within β galactosidase sequence.
A SPANS analysis [ 20] based on an in-house developed R application [ 26] was used to determine the optimal normalization for the peptide abundance values.
Cister identified two clusters of cis-elements, both upstream of exon A. The first cluster starts 4232 bp upstream of exon A, spans 467 bp and contains eight putative cis-elements.
Similar(53)
Even in a span of countless ages.
The three goals came in a span of 1 49.
In a span of minutes, the world turned upside down.
"They give you a span of 8 to 12 weeks.
21 of last season — a span of 31 games.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com