Experiment
                
                Near-infrared reflectance spectra at low temperature (300-80K) of Ammonium carbonate [(NH4)2CO3] powders with three grain size ranges (32-80, 80-125 and 125-150µm)
            
        
        
                            
                                
                            
                            
                                Sub-Experiment
                            
                           32-80 µm grain sizes
                        
                    
                    
                    
                    
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 270K (down) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 80K (down) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 90K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 100K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 110K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 120K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 130K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 140K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 150K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 160K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 180K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 200K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 220K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 245K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 270K (up) with 32-80 µm grain sizes
                                    
                                
                            
                                
                                    
                                    
                                        
                                            Spectrum
                                        
                                        
                                        Near-infrared reflectance spectra of Ammonium carbonate powder at 290K (up) with 32-80 µm grain sizes