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Fig. 4.

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FIF application on the four spectral indices of the inner ring spectrum used. The vertical dashed brown lines mark the central feature of each index. The spectral features are normalised using the index pseudo-continua (grey shaded regions). The black lines and the blue shaded regions represent the observed spectrum and the relative uncertainties, respectively, while the superimposed red dashed lines are the best-fit obtained from the posterior distribution.

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