Upper panel: the residuals of all four extraction regions obtained by just using the continuum model. Shown here are region 1 (all columns, blue), region 2 (without one column, red), region 3 (without three columns, black) and region 4 (without five columns, green). Middle panel: a Gaussian is added to the continuum model. Lower panel: the diskline model is used instead of a Gaussian.
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