7. Output File Format

The analysis results are output in a FITS file. Two different FITS layouts are available (selected with parameter outfiletype). For outfiletype=1, the file stores one interval (or frame) of interval results per FITS table row, and the output file will have a single extension. For outfiletype=2 (the default), the file stores one interval (or frame) per FITS extension, and the output file will have as many extensions as the number of intervals (or frames).

7.1 Statistical Keywords

A number of statistical variables (and errors if appropriate) associated with each interval (or frame) for each time series are calculated and stored as FITS keywords in the output file:

     * `AVRGE_n  ` - Average count/s in frame (in a frame this is the average
                     of the averages in intervals)
     * `AVRGE_En ` - Error in average
     * `FREXP_n  ` - Fractional exposure in frame (from average of fractional
                     exposures in intervals, the latter is the ratio of good
                     newbins to the total number of expected newbins/interval)
     * `FREXP_En ` - Error in fractional exposure
     * `VAROB_n  ` - Variance in frame (average of variances in intervals)
     * `VAROB_En ` - Error in variance
     * `VAREX_n  ` - Expected variance in frame (average of the expected
                     variances in intervals, the latter is calculated from the
                     error bars of the newbins
     * `VAREX_En ` - Error in expected variance
     * `THRDM_n  ` - Third  moment in frame (average of 3rd moments in intervals)
     * `MININ_n  ` - Minimum count/s in frame
     * `MAXIN_n  ` - Maximum count/s in frame
     * `EXVAR_n  ` - Excess variance in frame (average of excess variances in
                     intervals, the latter is calculated as variance-expected
                     variance)
     * `CHI2_n   ` - Chi-square in frame (average of chi-squares in intervals)
     * `CHI2_En  ` - Error in chi-square
     * `RMS_n    ` - RMS fractional variation in frame (average of RMS fractional
                     variation in intervals, the latter is calculated as the
                     square-root of the excess variance divided by the average.
     * `RMS_En   ` - Error in RMS

7.2 Columns

The standard output FITS files for XRONOS tasks (outfiletype=2) contain the following columns of data, documented using the form:

taskname (file extension)

     * `COLUMN    ` - column description

autocor (.fac)

     * `DELAY     ` - Time delay
     * `XAX_E     ` - Half-width of time delay bin
     * `AUTO_CORR ` - Auto correlation
     * `ERROR     ` - Error in auto correlation

crosscor (.fcc)

     * `DELAY     ` - Time delay
     * `XAX_E     ` - Half-width of time delay bin
     * `CROSS_CORR` - Cross correlation
     * `ERROR     ` - Error in cross correlation

efold (.fef)

     * `PHASE     ` - Phase
     * `XAX_E     ` - Half-width of phase bin
     * `RATEn     ` - Cnts/sec for series n
     * `ERRORn    ` - Error in rate of series n

If efold is given 2 series, additional columns are written:

     * `RATIO_12  ` - Ratio of ser2/ser1
     * `RAT_E12   ` - Error in ratio of ser2/ser1
     * `SUM12     ` - Sum of all (ser1+ser2)
     * `SUM_E     ` - Error in sum

If efold is given 3 series, additional columns are written:

     * `RATIO_12  ` - Ratio of ser2/ser1
     * `RAT_E12   ` - Error in ratio of ser2/ser1
     * `RATIO_23  ` - Ratio of ser3/ser2
     * `RAT_E23   ` - Error in ratio of ser3/ser2
     * `SUM123    ` - Sum of all (ser1+ser2+ser3)
     * `SUM_E     ` - Error in sum

If efold is given 4 series, additional columns are written:

     * `RATIO_12  ` - Ratio of ser2/ser1
     * `RAT_E12   ` - Error in ratio of ser2/ser1
     * `RATIO_34  ` - Ratio of ser4/ser3
     * `RAT_E34   ` - Error in ratio of ser4/ser3
     * `SUM1234   ` - Sum of all (ser1+ser2+ser3+ser4)
     * `SUM_E     ` - Error in sum

efsearch (.fes)

     * `PERIOD    ` - Period
     * `CHISQRD1  ` - Chi-square
     * `ERROR     ` - Error in chi-square

lcurve (.flc)

     * `TIME      ` - Phase
     * `XAX_E     ` - Half-width of time bin
     * `RATEn     ` - Cnts/sec for series n
     * `ERRORn    ` - Error in rate of series n
     * `FRACEXP   ` - Fractional exposure

If lcurve is given 2 series, additional columns are written:

     * `RATIO_12  ` - Ratio of ser2/ser1
     * `RAT_E12   ` - Error in ratio of ser2/ser1
     * `SUM12     ` - Sum of all (ser1+ser2)
     * `SUM_E     ` - Error in sum

If lcurve is given 3 series, additional columns are written:

     * `RATIO_12  ` - Ratio of ser2/ser1
     * `RAT_E12   ` - Error in ratio of ser2/ser1
     * `RATIO_23  ` - Ratio of ser3/ser2
     * `RAT_E23   ` - Error in ratio of ser3/ser2
     * `SUM123    ` - Sum of all (ser1+ser2+ser3)
     * `SUM_E     ` - Error in sum

If lcurve is given 4 series, additional columns are written:

     * `RATIO_12  ` - Ratio of ser2/ser1
     * `RAT_E12   ` - Error in ratio of ser2/ser1
     * `RATIO_34  ` - Ratio of ser4/ser3
     * `RAT_E34   ` - Error in ratio of ser4/ser3
     * `SUM1234   ` - Sum of all (ser1+ser2+ser3+ser4)
     * `SUM_E     ` - Error in sum

powspec (.fps)

     * `FREQUENCY ` - Frequency
     * `XAX_E     ` - Half-width of frequency bin
     * `POWER     ` - Power
     * `ERROR     ` - Error in power
     * `NUM_POINT ` - Number of power spectrum bins averaged in frequency
                      (as result of rebinning) or in time (as results of
                      averaging intervals in frame).

timeskew (.fts)

     * `DELAY     ` - Time delay
     * `XAX_E     ` - Half-width of time delay bin
     * `TIME_SKEW ` - Time skewness
     * `ERROR     ` - Error in time skewness