Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 0-25µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 25-50µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 50-100µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 100-200µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 200-280µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 280-400µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 400-560µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 560-800µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Volcanic tuff 800-1120µm grains at 298K, Patm