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Seems like the kinetic version of aruco_ros does not publicly expose the ArUco dictionary type on MarkerDetector construction or through a setter function. The melodic version however does include a dictionary type on construction (through overloaded int/string types), see this source file. Where the dictionary types are defined here.

It seems like these types are specific to the aruco_ros package and do not have a 1-to-1 match to the dictionary types defined in the opencv2 ArUco library.