Profiles of Very Weak Diffuse Interstellar Bands around 6440 A

Profiles of very weak diffuse interstellar bands (DIBs) between 6400 and 6470 Å observed with high resolution and very high S/N are demonstrated. We show that with the increasing quality of reddened stellar spectra, the whole spectral range is covered with weak or very weak DIBs—at least one every 2-3 Å. We also present the details of the profiles of a few stronger features; the presence of substructures resembles the profiles of strong DIBs observed in high resolution during the last decade and supports the hypothesis of a molecular origin of at least a majority of DIBs.