Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Smectite SWy-2 0-25µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Smectite SWy-2 25-50µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Smectite SWy-2 50-100µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Smectite SWy-2 100-200µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Smectite SWy-2 200-280µm grains at 298K, Patm Spectrum NIR bidirectional reflection spectrum (i=0°, e=30°) of Smectite SWy-2 280-400µm grains at 298K, Patm