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as r → ∞ ( ρ → ∞ ). One should note that for nonzero α the singularity may be null, while it is timelike for α = 0 (see Figs. 1 and 2). Also, figure 2 shows that depending on the metric parameters, these real solutions may be interpreted as black brane solutions with inner and outer horizons, an extreme black brane or naked singularity. 

