Table 1: Broad-band limiting magnitudes (4-m telescope with a $4096\times 4096$ CCD mosaic having 0.4-arcsec pixels, S/N= 5).
  B R I
1 night (127 s)1 24.4 24.1 23.7
1 season (7600 s)1 26.6 26.3 25.9
4 seasons (30 500 s)1 27.4 27.1 26.7
1 Because observations in I can be carried out during moonlit nights,
I have assumed integration times twice as long in I.

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