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Table 2
Photometric quality of the V passband exposures.
| Field | Exp. | N | V range | Lim. | σ | N90 |
| (s) | (mag) | (mag) | (mag) | |||
|
|
||||||
| Berkeley 87 | 60 | 1509 | 6–16.5 | 14.0 | 0.046 | 254 |
| NGC 6913 | 60 | 1650 | 8–16.5 | 14.0 | 0.047 | 265 |
| Cyg OB2 | 60 | 1392 | 6–16.5 | 14.0 | 0.045 | 284 |
| Berkeley 86 | 5/20 | 2033 | 8–15.5 | 12.0 | 0.044 | 102 |
| P Cygni | 10 | 1311 | 7–15 | 12.5 | 0.047 | 98 |
| NGC 7510 | 90 | 2146 | 8–17 | 14.0 | 0.044 | 456 |
| NGC 7654 | 10/40 | 2777 | 6–16 | 12.5 | 0.046 | 143 |
| PZ Cas | 30 | 1946 | 6–16 | 13.5 | 0.047 | 225 |
| NGC 581 | 8 | 850 | 7–14.5 | 12.0 | 0.041 | 95 |
| NGC 663 | 40 | 1841 | 6–16 | 13.5 | 0.043 | 288 |
| NGC 869/884 | 8/40 | 3321 | 6–16 | 12.5 | 0.049 | 269 |
| NGC 957 | 20 | 1103 | 7–15 | 13.0 | 0.045 | 102 |
| IC 1805 | 20 | 794 | 7–15 | 13.0 | 0.042 | 101 |
| EO Per | 120 | 1138 | 8–17 | 14.5 | 0.041 | 172 |
| Gem OB1 | 4 | 456 | 6–14 | 11.5 | 0.038 | 43 |
Notes. Limiting V magnitude (Lim.) is shown in Fig. 4 and represents the cutoff where stars have been detected on more than 90% of the frames. The number of stars that have been detected >90% (N90) is the total number of good quality sources in each field.
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