[daip] FLGIT

[Joseph Lazio]

Hi,

O.k., what am I doing wrong?  I've been using FLGIT to try to flag RFI 
from a 330 MHz run.  What appears to be happening is that FLGIT flags
the *good* channels, leaving the RFI channels.

Appended are the INPUTS to a recent run of FLGIT.  The u-v data set
used is a single scan from a 330 MHz run and is sitting at
<URL:ftp://republic.nrl.navy.mil/pub/J0431+29.SCAN>.

Sitting at <URL:ftp://republic.nrl.navy.mil/pub/J0431+29.FLGIT> is the 
output of FLGIT.  I've run this file (and the input file) through
SPFLG.  It looks like FLGIT is doing a good job at identifying the
RFI, but flags the good channels.  

(The two files are 15--20 MB in size.)


Any advice appreciated,

-- Joe

-- 
T. Joseph W. Lazio, Ph.D.        voice: +1 202 404 6329
Remote Sensing Division          fax:   +1 202 404 8894
Naval Research Lab, Code 7213    lazio at rsd.nrl.navy.mil
Washington, DC 20375-5351 USA    http://rsd-www.nrl.navy.mil/7213/lazio/


>TGET FLGIT;INP
AIPS 1: FLGIT     Flags data based on the rms of uv-data spectra
AIPS 1: Adverbs         Values            Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INNAME     'J0431+29    '          Input UV file name (name)
AIPS 1: INCLASS    'SCAN  '                Input UV file name (class)
AIPS 1: INSEQ         5                    Input UV file name (seq. #)
AIPS 1: INDISK        2                    Input UV file disk unit #
AIPS 1: OUTNAME    '            '          Output UV file name (name)
AIPS 1: OUTCLASS   '      '                Output UV file name (class)
AIPS 1: OUTSEQ        0                    Output UV file name (seq. #)
AIPS 1: OUTDISK       2                    Output UV file disk unit #.
AIPS 1: SOURCES    'J0431+29        '      Source list
AIPS 1:            *rest ' '
AIPS 1: QUAL         -1                    Source qualifier -1=>all
AIPS 1: CALCODE    '    '                  Calibrator code '    '=>all
AIPS 1: TIMERANG   *all 0                  Time range to purge
AIPS 1: SELBAND      -1                    Bandwidth to select (kHz)
AIPS 1: SELFREQ      -1                    Frequency to select (MHz)
AIPS 1: FREQID        1                    Freq. ID to select.
AIPS 1: BCHAN         2                    First channel selected.
AIPS 1: ECHAN        30                    Last channel selected.
AIPS 1: BIF           1                    Lowest IF number 0=>all
AIPS 1: EIF           0                    Highest IF number 0=>all
AIPS 1: SUBARRAY      0                    Subarray, 0=>all
AIPS 1: DOCALIB       1                    If >0 calibrate data
AIPS 1:                                    = 2 calibrate weights
AIPS 1: GAINUSE       2                    CL (or SN) table to apply
AIPS 1: FLAGVER       1                    Flag table version
AIPS 1: DOBAND        2                    If >0 apply bandpass cal.
AIPS 1:                                    Method used depends on value
AIPS 1:                                    of DOBAND (see HELP file).
AIPS 1: BPVER         1                    Bandpass table version
AIPS 1: OPCODE     '    '                  'MWFL' median window
AIPS 1:                                    else fit linear function
AIPS 1: APARM       200          20        Cutoff parameters: 1. Clip
AIPS 1:              20        *rest 0     2. Flag in BL regions
AIPS 1:                                    3. Flag in signal regions
AIPS 1:                                    4. Flag flux > A(4) * RMS
AIPS 1:                                    5. Flag Re/Im > A(5)*RMS
AIPS 1:                                    6. VPOL clip level
AIPS 1:                                    7. Width of median window
AIPS 1:                                    8. Number median pts averaged
AIPS 1:                                    9. Flag all samples with
AIPS 1:                                        |u| < APARM(9) lambda
AIPS 1: ICHANSEL      3          29        Select channels to fit: NOTE
AIPS 1:               1           1        this is start,end,increment
AIPS 1:               3           4        and IF for each region
AIPS 1:               1           2           7          11
AIPS 1:               1           2          13          29
AIPS 1:               1           2        *rest 0
AIPS 1: ORDER         1                    Order of fit line (0 -> DC)