 $INPUT
  SpicePath             = '\spice'                                          
  ListFileName          = 'C:\GRAMs\GRAM_Suite_1.3\Venus\IOfiles\venusGRAMLIST'            
  ColumnFileName        = 'C:\GRAMs\GRAM_Suite_1.3\Venus\IOfiles\VenusGRAMNominal'          
  EastLongitudePositive = 0   
    
  TimeFrame = 1
  TimeScale = 1
  Month     = 3
  Day       = 25
  Year      = 2020
  Hour      = 12
  Minute    = 30
  Seconds   = 0.0

  InitialRandomSeed        = 1234    
  DensityPerturbationScale = 1.0   
  EWWindPerturbationScale  = 1.0   
  NSWindPerturbationScale  = 1.0   
  MinimumRelativeStepSize  = 0.0

  TrajectoryFileName = 'null' 
  NumberOfPositions  = 401     
  InitialHeight      = 0.0     
  InitialLatitude    = 22.0   
  InitialLongitude   = 48.0    
  DeltaHeight        = 0.5    
  DeltaLatitude      = 0.     
  DeltaLongitude     = 0.     
  DeltaTime          = 0.

  AuxiliaryAtmosphereFileName = 'null'
  InnerRadius = 0.0
  OuterRadius = 0.0

  NumberOfMonteCarloRuns = 1    
 
  FastModeOn        = 0
  ExtraPrecision    = 0
  UseLegacyOutputs  = 0 
  DensityPrintScale = 0       

 $END                

 Explanation of variables:
  SpicePath         =  Path to NAIF Spice data
  ListFileName      =  List file name
  ColumnFileName      =  Output file name 
  EastLongitudePositive =  0 for input and output West longitudes positive
                           1 for East longitudes positive

  TimeFrame = 0 Planet event time (PET)
              1 for time input as Earth-receive time (ERT)
 
  TimeScale = 0 for Terrestrial (Dynamical) Time (TDT)
              1 for time input as Coordinated Universal Time (UTC)
              2 for Barycentric Dynamical Time (TDB)
  Month     = month of year                         
  Day       = day of month                    
  Year      = year (4-digit, or 1970-2069 can be 2-digit)
  Hour      = hour of day (meaning controlled by TimeFrame and TimeScale) 
  Minute    = minute of hour (meaning controlled by TimeFrame and TimeScale)                                       
  Seconds   = seconds of minute (meaning controlled by TimeFrame and TimeScale) 

  InitialRandomSeed        = starting random number (0 - 2^24 = 16,777,216) 
  DensityPerturbationScale = random perturbation scale factor for density (0 - 2)    
  EWWindPerturbationScale  = random perturbation scale factor for east/west winds (0 - 2)    
  NSWindPerturbationScale  = random perturbation scale factor for north/south winds (0 - 2)    
  PerturbationScales       = sets all perturbation scale factors (0 - 2)    
  MinimumRelativeStepSize  = Minimum relative step size for perturbations(0 - 1)
                         0.0 means always update perturbations, 
                         x.x means only update perturbations when relative step size > x.x

  TrajectoryFileName = (Optional) Trajectory input file name 
                       If present, then the values below are ignored 
  NumberOfPositions  = number of positions to evaluate 
  InitialHeight      = initial height (km)  
  InitialLatitude    = initial latitude (N positive), degrees  
  InitialLongitude   = initial longitude, degrees 
                       (depends on EastLongitudePositive)
  DeltaHeight        = height increment (km) between steps
  DeltaLatitude      = latitude increment (deg) between steps        
  DeltaLongitude     = longitude increment (deg) between steps
                       (depends on EastLongitudePositive)      
  DeltaTime          = time increment (seconds) between steps.
                      

  AuxiliaryAtmosphereFileName = (Optional) auxiliary profile input file name  
  InnerRadius = Lat-lon radius within which weight for auxiliary profile is 1.0
                (Use InnerRadius = 0.0 for no profile input)                   
  OuterRadius = Lat-lon radius beyond which weight for auxiliary profile is 0.0       
           
  NumberOfMonteCarloRuns = the number of Monte Carlo runs             

  FastModeOn        = Flags use of faster ephemeris computations (less accurate)
                      0 Most accurate ephemeris computations are used
                      1 Faster computations with slight loss in accuracy
  ExtraPrecision    = For the new column output format, this parameter 
                      adds precision to all outputs.
  UseLegacyOutputs  = Flags which outputs to generate.
                      0 Use the new output formats.
                      1 Use output formats closely matching those of the 
					    legacy NeptuneGram.
  DensityPrintScale = For legacy outputs only.
                      0 regular SI units
                      1 log-base-10 scale
                      2 percentage deviations from Mean model
                      3 SI units with density in kg/km**3 
  