Fig. 2
K-band spectra of NGC 4151 extracted from circular apertures with a radius of 125 mas. From top to bottom: nucleus, region 160 mas southwest of the nucleus, region 160 mas north of the nucleus, and region 600 mas northwest of the nucleus. The spectra are normalized to unity at 2.245 μm and shifted by multiples of 0.15. Detected species are indicated.
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