The image illustrates a graph of a preliminary spectrum of asteroid w:773 Irmintraud, a main belt w:D-type asteroid that appears to show the presence of a 3-µm wavelength w:water of hydration band. The image is from Lebofsky, Larry A. (1992) NASA Technical Reports Server. An Infrared Reflectance Study of Low Albedo Surface Constituents. N92-10830; Page 273. The image was cleaned by Wikipedian uploader for presentation, but is slightly rotated clockwise in the original and uploaded version.

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