ISO  LWS  ASCII  files

Each ASCII file has been created with columns of data. The first line of each ASCII file contains the column headers as defined within ISAP. These ASCII files may be read directly into ISAP so that you can begin your data reduction. For more information on how to read ASCII files into ISAP, see ASCII READ.  Different observations will have different columns of data. The column headers most frequently used and their definitions are as follows:

wave Wavelength (microns)
flux Flux (W/cm^2/um)
stdev Standard Deviation of flux (W/cm^2/um)
det LWS Detector number (0-9)
line LWS Line number for L02 line scans (0-9)
rpid Raster Point ID for raster observations (x,y);  rpid=(256*x)+y

The ISO LWS instrument had 10 detectors, covering different wavelengths with some overlap between adjacent detectors. For an L02 line scan observation, each line scanned had a designated line number. There is a corresponding "active" detector number. If an observation was an L02, the line and active detector numbers are given from the summary page. Together the two can be used to plot the lines that were scanned. There are four logical ways to separate data within these ASCII files, depending on the AOT. The table below shows how you may exclusively choose the data by matching up the the common values within these columns:

L01  Pointed  L02  Pointed  L01  Raster  L02  Raster 
det  line  rpid  rpid 

det  det  line