definitions: string array specifying variable definintions                      
amodel: string defining source model, e.g., TIE-GCM, TIME-GCM, MSIS/IRI, WACCM-X 
gmodel: string defining version of GLOW model used                             
date: date in yyddd format                                                      
ut: universal time in seconds                                                   
f107: daily F10.7 index                                                         
f107a: F10.7 index 81-day centered average                                      
ap: Ap index (daily if MSIS/IRI run, derived from HP or 3-hour Kp if TGCM run)  
chi: grid angle from satellite toward Earth in east-west direction (deg., +E)   
psi: grid angle from satellite toward Earth in north-south direction (deg., +N) 
wavelength: wavelength at center of bin (nm)                                                     
imagecube: array of slant column brightness [chi,psi,wavelength] (Rayleighs)    
scbo5s: slant column brightness of O(5S) doublet at 135.6 & 135.9 nm (Rayleighs) 
scblbht: slant column brightness of the LBH bands 137-160 nm (Rayleighs) 
scblbhs: slant column brightness of the LBH "short" bands 141-153 nm (Rayleighs) 
scblbh30: slant column brightness of the LBH (3,0) band at 135.4 nm (Rayleighs) 
altref: reference altitude (km) (using 150 km for disk, tangent point for limb) 
latref: latitude at reference altitude at each grid point (degrees)             
lonref: longitude at reference altitude at each grid point (degrees)            
lstref: local solar time at reference altitude at each grid point (hours)       
szaref: solar zenith angle at reference altitude each grid point (degrees)      
ezaref: emission zenith angle at reference altitude at each grid point (deg.)
tref: temperature at reference altitude at each grid point, disk only (K)       
teff: effective temperature weighted along line of sight at each grid point (K) 
flag: flag indicating type of observation, 0=nothing, 1=limb, 2=disk           
