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In this poster we show our preliminary analysis of DIBs (Diffuse InterstellarBands) and other interstellar absorption lines with the purpose ofunderstanding their origin and their relationship with extinction. We use thebiggest Galactic O-star blue-violet spectroscopic sample ever (GOSSS, seecontribution by Ma\'iz Apell\'aniz at this meeting). This sample allows a newinsight on this topic because of the adequacy of O-star spectra, the samplenumber (700 and increasing, 400 used here), and their distribution in the MWdisk. We confirm the high correlation coefficients between different DIBs andE(B - V), though the detailed behavior of each case shows small differences. Wealso detect a moderately low correlation coefficient between Ca II{\lambda}3934 (Ca K) and E(B - V) with a peculiar spatial distribution that weascribe to the relationship between line saturation and velocity profiles forCa II {\lambda}3934.

Science with the Galactic O-Star Spectroscopic Survey (GOSSS) : The relationship between DIBs, ISM, and extinction