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Table 1
BL Lac objects considered in this study.
| Name | RA | Dec | z | R |
| [h m s] | [d m s] | [mag] | ||
|
|
||||
| 0716+714 | 07 21 53.44 | +71 20 36.36 | ~0.300 | 15.6–11.5 |
| MRK 421 | 11 04 27.31 | +38 12 31.79 | 0.031 | 13.3–11.7 |
| BL Lac | 22 02 43.29 | +42 16 39.98 | 0.069 | 15.3–12.3 |
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