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Figure 76. Fresh (newly fallen) snow, firn (denser than snow but not yet ice), bare glacier ice, and debris-covered glacier ice discriminated on four spectral bands (1–4) recorded by the Landsat Thematic Mapper (TM) sensor. Modified from Hall and others (1989, p. 28, fig. 7); see also Hall and others (1988, p. 317, fig. 4).