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Interstellar diffuse bands are usually extracted from hot star spectrabecause they are characterized by smooth continua. It introduces a stronglimitation on the number of available targets, and reduces potential studies ofthe IS matter and the use of absorptions for cloud mapping. We have developed anew automatic fitting method appropriate to interstellar absorptions in spectraof cool stars that possess stellar atmospheric parameters. We applied thismethod to the extraction of three DIBs in high resolution VLT FLAMES/GIRAFFEspectra of red clump stars from the bulge. By combining all stellar syntheticspectra, HITRAN-LBLRTM atmospheric transmission spectra and diffuse bandempirical absorption profiles, we determine the 6196, 6204, and 6284 A DIBstrength toward the 219 target stars and discuss the sources of uncertainties.In order to test the sensitivity of the DIB extraction, we intercompare thethree results and compare the DIB equivalent widths with the reddening derivedfrom an independent extinction map based on OGLE photometric data. Most stellarspectra could be well reproduced by the composite stellar, atmospheric andinterstellar models. Measurement uncertainties on the EWs are smaller for thebroad and strong 6284 A DIB, and are of the order of 10-15%. Uncertainties onthe two narrow and weaker DIBs are larger, as expected, and found to be highlyvariable from one target to the other. They strongly depend on the radialvelocity of the star . DIB-DIB correlations among the three bands demonstratethat a meaningful signal is extracted. For the 6284 and 6204 A DIBs, thestar-to-star variability of the equivalent width (EW) also reflects features ofthe OGLE extinction map...

Extracting interstellar diffuse absorption bands from cool star spectra: Application to bulge clump giants in Baade's window