Experiment
                
                Near-infrared reflectance spectra at low temperature (300-80K) of Mascagnite and FE-Ammmonium sulfate [(NH4)2SO4] powders with three grain size ranges (32-80, 80-125 and 125-150µm)
            
        
        
                            
                                
                            
                            
                                Sub-Experiment
                            
                           32-80 µm grain sizes
                        
                    
                    
                    
                                    
                                        
                                    
                                    
                                        Sub-Experiment
                                    
                                    cooling down around Mascagnite - FE-Ammmonium sulfate phase transition at 223K
                                
                            
                            
                                    
                                        
                                            
                                            
                                                
                                                    Spectrum
                                                
                                                
                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 270K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 227K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 226K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 225K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 224K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
                                                    Spectrum
                                                
                                                
                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 223K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 222K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 221K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 220K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 219K (down) with 32-80 µm grain sizes
                                            
                                        
                                    
                                
                            
                                    
                                        
                                    
                                    
                                        Sub-Experiment
                                    
                                    warming up in FE-Ammmonium sulfate phase (80-200K)
                                
                            
                            
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 80K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 90K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 100K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 110K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 120K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 130K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 140K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 150K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 160K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 170K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 180K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 190K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 200K with 32-80 µm grain sizes
                                            
                                        
                                    
                                
                            
                                    
                                        
                                    
                                    
                                        Sub-Experiment
                                    
                                    warming up around FE-Ammmonium sulfate - Mascagnite phase transition at 223K
                                
                            
                            
                                    
                                        
                                            
                                            
                                                
                                                    Spectrum
                                                
                                                
                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 219K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 220K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 221K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of FE-Ammmonium sulfate powder at 222K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of mix of FE-Ammmonium sulfate and Mascagnite (PE-Ammmonium sulfate) powder at 223K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
                                                    Spectrum
                                                
                                                
                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 224K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
                                                    Spectrum
                                                
                                                
                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 225K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 226K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 227K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 230K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 245K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 270K with 32-80 µm grain sizes
                                            
                                        
                                    
                                        
                                            
                                            
                                                
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                                                Near-infrared reflectance spectra of Mascagnite (PE-Ammmonium sulfate) powder at 290K with 32-80 µm grain sizes