Fig. 1.
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Dispersion relation for a one-component stellar disc (Eq. (44)) shown for Q = 1.1 and for β = 0.1 − 0.3. For comparison, the corresponding dispersion relation for the zero-thickness (or infinitesimally thin) stellar disc is also shown (dashed black line). The horizontal dashed line (in black) denotes the |s|obs value (calculated at R = 8.27 kpc) corresponding to an assumed pattern speed of 12.5 km s−1 kpc−1.
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