method | reference | EB-V |
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van den Bergh & Younger (1987) | 0.43 |
(B-V)t2 | van den Bergh & Younger (1987) | 0.40 |
K I ![]() |
Munari & Zwitter (1997) | 0.45 |
O I emission line ratios | Rudy et al. (1991) | 1.23 |
Dust maps | Schlegel et al. (1998) | 0.58 |
He II
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Williams (1994) | 0.57 |
H I
![]() |
Williams (1994) | 0.65 |
He I
![]() |
Osterbrock 1989 | 0.9 |
He I
![]() |
Robbins (1968) | 0 |