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approximately

Use the full word. Preferable to "about".

Don't abbreviate to "approx.", or worse, the symbol  "~".

The luminosity of the LHC has increased by approximately 16% over the last two months.

barn

Symbol b.

A unit of area. A barn is 10−28 m2 (100 fm2), about the cross-sectional area of a uranium nucleus.

A barn expresses the cross section of any scattering process, which relates to the probability of interaction between small particles.

Sample size at CERN is often expressed in femtobarns and luminosity is expressed in inverse femtobarns.

capital letters

Use minimal capitalization. A heading starts with a capital, but other words should not be capped up, unless they are proper nouns. If in doubt, choose lower case.

Exceptions include: our Sun, Earth (the planet), and our Solar System, but not universe, moon, earthquake, earth (the soil).

Use a capital letter when you are writing the names of people, languages, places, and words relating to them:

Africa, African
Buddha, Buddhism
Shakespeare, Shakespearean

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