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Fig. 1


The optical spectrum of the optical counterpart to MXB 0656-072 in the 4000–4800 Å region. The identified lines correspond to He II λ4200, λ4541, λ4686, He I λ4026, λ4144, λ4387, λ4471, λ4713, C III λ4070, λ4650, N III λ4640, Si IV λ4089, λ4116, and the hydrogen lines of the Balmer series between Hβ and Hϵ. A Gaussian smoothing filter (σ = 1) was applied to reduce the noise.

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