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Table 3
Historic spectral type determinations of LX Cyg.
| Date | Sp. type | Reference |
| dd/mm/yyyy | ||
|
|
||
| 22/10/1952 | S LaO 3 | Terrill (1969) |
| 05/09/1954 | S LaO 3 | Terrill (1969) |
| 20/08/1955 | S | Cameron & Nassau (1956) |
| 27/09/1956 | S LaO 2–3 | Terrill (1969) |
| 05/10/1957 | S LaO 2 | Terrill (1969) |
| 12/09/1958 | S LaO 2: | Terrill (1969) |
| 07/06/1962 | S LaO 3 | Terrill (1969) |
| 03/10/1965 | S LaO 1 | Terrill (1969) |
| 27/08/1975 | S5.5e: Zr 1 | Ake (1979) |
| 14/11/1976 | SC3e Zr 0.5 | Ake (1979) |
| 18/10/1977 | SC8/8.5e | Keenan & Boeshaar (1980) |
| 29/10/1978 | SC7/9–e | Keenan & Boeshaar (1980) |
| 02/08/1979 | SC4:/8e | Keenan & Boeshaar (1980) |
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