Unfamiliar Scientific Notation

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I am reading a paper that uses notation like $10^{15\pm1}$ that I have never seen before. I can guess that it means the number is in the interval of $10^{14}$ to $10^{16}$, but I would appreciate it if someone can confirm my guess (or tell me what it means).

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One would need more context to be able to say for sure. However, it is likely that you are right that the author(s) most likely mean $10^{15 \pm 1}= [10^{14}, 10^{16}]$, i.e. that the number varies by plus or minus an order of magnitude (rather a lot of variation....depending on the context).