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Table 2
Reference image details.
| Cluster | Exp. Time (s) | PSF FWHM | Fig. No. | |
|
|
||||
| NGC 6388 | 240.0 |
|
2 | |
| NGC 6441 | 312.0 |
|
7 | |
| NGC 6528 | 348.0 |
|
12 | |
| NGC 6638 | 374.4 |
|
15 | |
| NGC 6652 | 403.2 |
|
18 | |
Notes. Combined exposure time and FWHM for the reference images. The reference images are used to show the positions of the variable stars in Sect. 3 and the last column gives the Figure numbers for these.
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