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Table 4.

Number of sources in the catalogue for the stated survey and filter combinations.

N (×106) N (×106)
errBits = 0
IGAPS (surveys combined)

All 295.4 205.2
IPHAS 264.3 186.1
UVEX 245.8 170.7
IPHAS + UVEX 214.7 151.6


i, Hα, rI 168.4 115.4
i, rI 31.7 25.2
i 25.6 18.9
Hα 15.7 11.2
rI 16.3 12.0


rU, g, URGO 54.3 30.0
rU, g 101.1 72.7
rU 76.2 60.6
g 12.7 6.8

Notes. The first column of numbers counts all catalogue rows, while the second gives totals for the best-quality errbits = 0 sources. Combinations of filters not shown individually account for less than 2% of the total number of catalogue rows. The IPHAS part of the table pays no attention to whether there are any UVEX detections and vice versa for the UVEX part of the table.

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