UKIRT Infrared Deep Sky Survey / Ultra-Deep Survey (UKIDSS/UDS)
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This product contains the catalogue from the UKIDSS Ultra-Deep Survey extracted
by Mattia.  The `data/query_tool` folder contains the scripts and SQL queries
used to get the data from the UKIDSS database.

The descriptions of the columns of the UDS table in the UKIDSS database is
available there: http://wsa.roe.ac.uk/www/WSA_TABLE_udsSourceSchema.html#udsSource

The UDS field is inside HELP XMM-LSS field.

The magnitudes are “*Vega like*”.  The AB offsets are given by Hewett *et al.*
(2016):

| Band | AB offset |
|------|-----------|
| J    | 0.938     |
| H    | 1.379     |
| K    | 1.900     |