Acronyms used in the EPOXI Data Archive                                       
                                                                              
ADC        Analog-to-Digital Converter                                        
ASCII      American Standard Code for Information Interchange                 
BJD        Barycentric Julian Date                                            
CODMAC     Committee on Data Management and Computing                         
DN         Data number                                                        
DI         Deep Impact                                                        
DIXI       Deep Impact eXtended Investigation                                 
EDR        Edited Data Record (raw data counts)                               
EME J2000  Inertial reference frame for the Earth Mean Equator (EME) and      
           Vernal Equinox J2000                                               
EPOCh      Extrasolar Planet Observation and Characterization investigation   
EPOXI      Mission name for the combined EPOCh and DIXI projects              
FITS       Flexible Image Transport System                                    
HRI        High Resolution Instrument/Telescope                               
HRII       High Resolution Instrument, Infrared Spectrometer                  
HRIV       High Resolution Instrument, Visual CCD                             
IDL        Interactive Data Language, a data visualization and analysis       
           platform                                                           
IEEE       Institute of Electrical and Electronics Engineers                  
IF         Nomenclature for irreversibly cleaned, calibrated data (CODMAC     
           level 4) in units of  reflectance, also known as I-over-F or       
           I/F, and defined as the radiance divided by the solar spectrum     
           multiplied by pi; For Deep Impact and EPOXI, I/F data are          
           unitless                                                           
IFREV      Nomenclature for irreversibly calibrated data (CODMAC level 3)     
           in units of reflectance, also known as I-over-F or                 
           I/F, and defined as the radiance divided by the solar spectrum     
           multiplied by pi; For Deep Impact and EPOXI, I/F data are          
           unitless and are not cleaned                                       
IR         Infrared                                                           
ITS        Impactor Targeting Sensor, Visual CCD                              
MRI        Medium Resolution Instrument, Visual CCD                           
ODL        Object Description Language                                        
PDS        NASA Planetary Data System                                         
PI         Principle Investigator                                             
FITS       Flexible Image Transport System                                    
NAIF       Navigation and Ancillary Information Facility                      
NASA       National Aeronautics and Space Administration                      
RAW        Nomenclature for edited, raw data (CODMAC level 2) in units of DN  
RAD        Nomenclature for irreversibly cleaned, calibrated data (CODMAC     
           level 4) in units of radiance                                      
RADREV     Nomenclature for reversibly calibrated data (CODMAC level 3) in    
           units of radiance; data are not cleaned                            
RDR        Reduced Data Record (calibrated to physical units)                 
SBN        Small Bodies Node of the PDS                                       
SCLK       Spacecraft Clock Kernel (a SPICE data product)                     
SDC        Deep Impact and EPOXI Science Data Center at Cornell University    
SIS        Software Interface Specifications (archive description)            
SPICE      Spacecraft, Planet, Instrument, Pointing C-matrix, and Event       
           kernels (a historical acronym for NAIF)                            
SSBC       Solar System Barycenter                                            
TDB        Barycentric Dynamical Time