Distribution functions of orientation angles for the selected ridges derived from the Hessian analysis on T353. They are computed within three bins of Galactic latitudes with equal numbers of data points. The mean absolute latitudes are 7°, 17°, and 33° for the DFs plotted in black, orange and red, respectively. The image shows that the method does not introduce any bias as a function of Galactic latitude in estimating θ.
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