Fig. A.1.

Two-dimensional and one-dimensional PDFs of the model parameters for NGC 3621: the two-dimensional PDFs are shown on the lower triangular of the matrix and the one-dimensional PDFs on the principal diagonals. The red and blue contour in each panel delineates the 68% and 95% confidence levels. The cyan stars correspond to Model-C, the blue diamonds to Model-A and the red square to Model-B.
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