Spectrum Vis-NIR bidirectional reflection spectrum of pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K Spectrum Vis-NIR bidirectional reflection spectrum of ammonium chloride (9 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K Spectrum Vis-NIR bidirectional reflection spectrum of ammonium sulfate (9 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K Spectrum Vis-NIR bidirectional reflection spectrum of ammonium sulfate (23 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K Spectrum Vis-NIR bidirectional reflection spectrum of ammonium formate (17 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K Spectrum Vis-NIR bidirectional reflection spectrum of ammonium formate (17 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K (duplicate) Spectrum Vis-NIR bidirectional reflection spectrum of ammonium carbamate (17 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K Spectrum Vis-NIR bidirectional reflection spectrum of ammonium citrate (23 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K