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Figure 1 from Hubble 1929 has velocity with units of km. Is this just a typo or was there a reason the plot is printed this way?

enter image description here

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The paper indicates that it should be km/s. Maybe the creator of the graph was not awake when it was made. –  LDC3 Aug 17 at 2:15

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It is in fact supposed to be KM/S (KILOMETRES a second) I think that whoever authored the paper probably took it as a random shortcut and assumed anyone reading it would either have read the paper and understand it is supposed to be km/s or just assume it from the fact it says velocity

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