NaD equivalent widths, estimated in the best-fit stellar spectrum, obtained via pPXF (Sect. 3.1) versus the integrated stellar contribution (Table 2). Horizontal line indicates our conservative choice of EW(NaD) (i.e., 1.3 Å) for identifying the NaD originated in the ISM in the maps (Sect. 4.1). Vertical lines follows the adopted definition for interstellar dominated, medium-contaminated, and stellar-dominated objects (Sect. 4.1). Symbols are color-coded accordingly to the quality of the stellar modeling on the integrated spectrum (e.g., Q, Table 2). Specifically, light blue and pink symbols indicate good and very good quality stellar modeling, Q = 2 and Q = 3, respectively.
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