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Table 2

Velocity distribution parameters for the disc components of M 31.

Component σ or c Comments
[km s-1]

Main stellar disc 25–40 a function of R
Young stellar disc 15a a constant value
Cold gas disc 6 a constant value
Warm gas disc 7.3 a constant value



Calculations were also made for dispersions of 10 km s-1 and 22.5 km s-1.

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