  Radial-velocity measurements and sine-curve fits to the orbital velocity
variations are presented for the sixth set of ten close binary systems: SV Cam,
EE Cet, KR Com, V410 Cyg, GM Dra, V972 Her, ET Leo, FS Leo, V2388 Oph, II UMa.
All systems except FS Leo are double-lined spectroscopic binaries. The type of
FS Leo is unknown while SV Cam is a close, detached binary; all remaining
systems are contact binaries. Eight binaries (all except SV Cam and V401 Cyg)
are the recent photometric discoveries of the Hipparcos satellite project. Five
systems, EE Cet, KR Com, V401 Cyg, V2388 Oph, II UMa, are members of
visual/spectroscopic triple systems. We were able to observe the close binary
system EE Cet separately of its companion, but in the remaining four systems we
could separate the spectral components only through the use of the
broadening-function approach. Several of the studied systems are prime
candidates for combined light and radial-velocity synthesis solutions.
