Overall survey parameters:
4 year hard limit for UKST funding (to June 2005).
Button size + plate scale => twice over coverage
2 x 17,000 deg2 / 25 deg2 =1400 fields
18 nights x 13 lunations x 4 years x 75% 6dFGS x 50% clear x 4 fields/night = 1400 fields
1400 fields x 130 targets/field = 180,000 spectra
reserve 10,000 for z-survey reobservation, 10,000 for Dn-s reobservation => 160,000 observable targets.