Table 2
Number of images after each reduction step.
| LCO | align. | comb./diff. | light curve | |
|---|---|---|---|---|
| HE1104-1805, R | 353 | 273 | 76 | 76 |
| HE1104-1805, V | 370 | 317 | 89 | 86 |
| HE2149-2745, R | 488 | 446 | 126 | 124 |
| HE2149-2745, V | 423 | 385 | 108 | 103 |
| Q2237+0305, R | 384 | 326 | 94 | 94 |
| Q2237+0305, V | 386 | 313 | 93 | 93 |
Notes. Number of images remaining after each reduction step, which are original images from LCO, aligned images after sorting out bad images, combined images and difference images from every observation night and finally number of nights used for the light curves, excluding a small number of data points with very large uncertainties (see Sect. 4).
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