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The HR diagram from Figure 3, with additional labelling showing the masses of stars on the Main Sequence. The masses run from 30 solar masses at the top left for the hottest and brightest 'O' class stars, down to 0.2 solar masses for the faintest 'M' class stars at the bottom right. The Sun has a mass of 1.

 3.1┬áMeasuring the masses of stars