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Consider the following sentence:

Also on Fig. 2, is the estimated price of a pizza at five locations along the highway (z=0, 4, 6 and 8km).

or

Also on Fig. 2, is the estimated price of a pizza at five locations along the highway (z=0km, 4km, 6km and 8km).

or

Also on Fig. 2, is the estimated price of a pizza at five locations along the highway (z=0km, z=4km, z=6km and z=8km).

which is a proper way to present units?

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    In any case, add a thin space between the number and the unit. – egreg Apr 19 at 21:39
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The answer will depend on your style guide. A Style guide that I am familiar with, the American Physical Society Style manual, says,

Do not repeat units of measure in a series of 2 or more items, in a range of values, with a ± symbol, with the combinations "from...to" and "between...and", with versus (vs.), or with a multiplication (×) symbol. However, when other words intervene, units can be repeated if necessary for clarity.

So your first option looks right to me.

  • This was exactly the situation and answer that I was looking for. – wander95 Apr 19 at 20:21
  • Welcome to English Language & Usage. – MikeJRamsey56 Apr 19 at 20:23

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