ASCII READ


Whenever "AAR ASCII" is selected under "READ DATA" in ISAP, a popup will appear asking for the units of wavelength, flux, and standard deviation. Acceptable units are described in the CHANGE UNITS documentation.  If there are data tag names used as column headers in the ASCII file, there are only 15 acceptable tag names for these column headers. These tag names are described in the documentation of an AAR.

There are three types of ASCII files that ISAP can read.
 

  • ASCII file written by ISAP that contains all data.  An ASCII file has been created by ISAP and contains a standard ISO header, a line with the number of tags in the data, a line with the tag names for the columns, and the columns of data.  An example of this type of file looks like:
    • ISO FITS Header
number of tags in aar.data:     7   
wave    flux    stdev     det     line    status  flag 
60.0    1.5e-18 1.0e-20   2       1       0       0
100.0   1.0e-18 1.0e-19   6       2       0       0
.       .       .         .       .       .       .
.       .       .         .       .       .       .
    ASCII file with column headers and data.  The first line of this file are the column headers (tag names).  This line is followed by the data columns.  An example of this type of file looks like: 
    wave    flux    stdev     det     line    status  flag
60.0    1.5e-18 1.0e-20   2       1       0       0
100.0   1.0e-18 1.0e-19   6       2       0       0
.       .       .         .       .       .       .
.       .       .         .       .       .       .
    ASCII file with only columns of data.  The first two columns are assumed to be wavelength and flux.  If a third and fourth column exist, they are assumed to be stdev and flag.  An example of this type of file looks like:

    57.0               3.0e-18
    60.0               2.0e-18
    90.0               6.0e-19
    100.0             4.0e-19
    120.0             2.0e-19
    .                      .
    .                      .