O VI channel parameters referring to the period from 1996 April to 1997 December during the daily UVCS synoptic observation program: heliocentric distance of the UVCS instantaneous field of view (a), intensity of the 1031.92 Å (black) and 1037.61 Å (red) spectral lines (b), doublet intensity ratio ρ (c), and variance of the 1031.92 Å line, corrected for instrumental effects, σ² (d).