Fig. 2.
Normalised perturbed distribution function in the presence of the large bar perturbation of Portail et al. (2017). Top panel: for an unperturbed distribution function representing a young and cold disc stellar population with σR = 30 km s−1 at the Galactocentric solar radius R0. Bottom panel: for an older and hotter disc population with σR = 50 km s−1 at the Galactocentric solar radius R0.
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