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Table 1

Best-fit model parameters for the molecular ring components of NGC 6302.

Structure rinner router h ϕ1 ϕ2 PA i δV n T Vexp
(1016 cm) (1016 cm) (1016 cm) (km s-1) (cm-3) (K) (km s-1)

Inner ring constant value

Blue inner ring 8.8 9.7 1.1 –165o –10o 270o –75o 2 2.3 260 8.5
Red inner ring 8.8 9.7 1.8 8o 100o 270o –75o 2 2.4 300 11

Outer ring linear V max

Blue outer ring 9.7 13.2 2.6 –165o –10o 270o –75o 1 1.6 40 14
Red outer ring 9.7 14.9 1.8 8o 100o 270o –75o 1 4 60 17

Notes. The sizes correspond to a distance to the nebula of 1.17 kpc. The uncertainty range is included for every parameter except for those concerning the geometry. Parameters: rinner and router are the inner and outer radii of the ring, and h is its thickness. ϕ1 and ϕ2 are the lowest and highest values of the angular span of the ring, as defined within SHAPE. PA and i are the position angle and inclination of the symmetry axis of the structure, as defined within the SHAPE modifier “PA/Inc Rotation”. δV, n, and T are the microturbulence velocity, the density, and the temperature, respectively. Vexp is the expansion velocity. In the case of the inner ring, it is a constant value. The value of the velocity shown for the outer ring is the velocity of the farthest edge from the star, with the velocity following a linear, ballistic expansion pattern.

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