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Table 1
Log of spectroscopic observations of HT Cas.
| Set | Date | Telescope/ | λ range | Exp. time | Number | Duration | |
| instrument | (Å) | (s) | of exps. | (h) | |||
|
|
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| Set-1986 | 1986-Sep.-08 | 6.0 m / SP-124 | 3600–5500 | 300 | 15 | 1.77 | |
| 1986-Sep.-09 | 6.0 m / SP-124 | 5400–7300 | 360 | 16 | 2.12 | ||
| Set-1992 | 1992-Dec.-16 | 6.0 m / SP-124 | 3600–5500 | 300 | 14 | 1.41 | |
| Set-1995 | 1995-Sep.-09 | 6.0 m / SP-124 | 3860–5800 | 180 | 58 | 3.54 | |
| Set-2005 | 2005-Oct.-29 | 2.1 m / B&Ch | 4600–6700 | 293 | 40 | 3.54 | |
| 2005-Oct.-31 | 2.1 m / B&Ch | 6150–7225 | 293 | 40 | 3.54 | ||
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