  Superpositions of stellar tracings are present in every slitless
spectrograph. The probability for such overlaps in the GAIA RVS spectrograph
focal plane is estimated using photometric observations of 66 stellar fields,
mostly close to the Galactic plane. It is shown that overlaps of bright stars
(V<17) are common near the Galactic plane, and no spectrum is free from
superpositions of faint star tracings. Most overlappers are of spectral type K.
