Fig. A.1
Amplitude Φm of the harmonics of gravitational potential for the stellar and gaseous disks of M 99, in units of 103 km2 s-2, with m = 0,1,2,3. The left-hand column is for the atomic gas disk, the middle one for the stellar disk and the right-hand column for the molecular gas disk. For the stellar component, the axisymmetric potential of the bulge has been removed.
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