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Fig. 2.


Positions of our final stream member selection in Galactic Cartesian (top, centered on the Sun) and Galactocentric cylindrical (bottom panel) coordinates. In the Cartesian frame, X is positive toward the Galactic center, Y is positive in the direction of Galactic rotation, and Z points to the Galactic north pole. In the bottom row, the position of the Sun is indicated with the black circular symbol. The small blue dots correspond to all sources that were identified in our 6D clustering application, while the filled circles are sources in our final stream selection. The colorscale of the filled circles is proportional to source density, with darker shades referring to higher densities. The arrows in the bottom row visualize the velocity vector. The sources depict a strikingly flat spatial arrangement with an extent of at least 400 pc along its major axis.

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