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Fig. 4

image

Multicomponent 6614 Å DIB fitting: GIRAFFE field 1, GES target 06441034-0048254. The red line shows the stellar spectrum. The dotted lines are the models: stellar (orange), telluric (green), empirical DIBs (gray). The thick blue line is the best model adjustment. The initial guesses for the DIB velocity centroids are 24, 40, and 50 km s-1 and are based on the HI spectrum in the same direction (see top plot). Middle: an example of a preliminary adjustment with a unique DIB component. The DIB velocity is found to be ~33 km s-1. The large difference from the initial guess (24 km s-1) demonstrates the need for a second cloud component. Bottom: an example of a subsequent adjustment with two DIB components. The two fitted velocities are now close to the first two HI emission peaks.

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