DAEDALUS FILE FORMATS

I.  Daedalus data file format

    A Daedalus data file is an ASCII text file containing 52 fixed-
length 52-byte records.  The first 16 records are header records, and
the remainder are data records.  Each header record has an ASCII blank
and a dollar sign ($) following the text in the record, and the bytes
following the dollar sign are blanks.  The last two bytes in each record
contain ASCII carriage return and line feed characters.

    The header records have the following format:

record     description                        example
------     -----------                        -------
  1        File format, system name           4, SPECTRAFAX AA440
  2        Operating mode                     2
  3        Number of data sets averaged       0
  4        Name of file                       ubecalc.007
  5        Date and time of data collection   Wed Jul 19 10:20:09 1989
  6        Reserved
  7        Gain setting                       44
  8        Comment                            No Message
  9        Number of steps per scan           360
 10-16     Reserved

    Each of the 36 data records (records 17 through 52) contains ten 5-
character integers, right justified.  These 360 integers are the raw
data collected by the spectrometer.  

II.  Daedalus wavelength file format

    The Daedalus wavelength file (also known as the calibration file in
the Daedalus AA440 Spectrafax User's Guide) is an ASCII text file
containing 369 40-byte fixed-length records.  The first nine records are
header records, and the remainder are data records.  The last two bytes
in each record contain the ASCII carriage return and line feed
characters.  The wavelength file is named DAEDWAVE.DAT and is located in
the DAEDALUS directory on Volume 1 of the GRSFE CD-ROM set.

    The header records have the following format:

record  description               example
------  -----------               -------
  1     Calibration date          28 March 1988
  2     Calibration instrument    Monochromator
  3     Calibration source        Daedalus - dsd
  4     Comment                   Two pass -crossover at 140
  5     Identification number of  0FF9
        scan head
  6     Segment transitions       3,  450,  727,  728, 1301, 1302, 2400
  7     Detector transitions      2,  450, 1200,  900, 2400
  8     Home index offset,        0,1
        default wheel rotation
  9     Number of steps per scan  360

    Each of the 360 data records (records 10 through 369) contains five
integers separated by commas.  The first number is the motor step number
(0 through 359).  The second number is the peak wavelength for that step
in nanometers (0 if unused).  The third number is the segment number for
that motor step (1 through 3).  The fourth number is the gain-offset for
that motor step.  The fifth number is the number of deconvolution
coefficients to follow, and is currently always 0.