[daip] dftpl

[Farhad Zadeh]

Hi Eric,
I have been using DFTPL quite a bit for the last few years and now
am experiencing two major problems. One is a VLBA  data
that Andreas has reduced and I am trying to get a light curve.
However, I see these zero amplitude visibilities which
should not be there when the averaging  time is 5s in DFTPL.
Andreas tells me that the data is sampled at less than less than a second.
How can I remove these low level values? see below the parameters
of DFTPL.

The other issue is that when I have a cube and use BCHAN and ECHAN in
DFTPL gives me exactly the light curve of one channel but the 
uncertainties reduced by the number of channels. DFTPL never looks
at the values of each channel in the cube. There is certainly a bug in
DFTPL. I'd be happy to send you the data if you can't confirm.
Many thanks for your response.
Cheers,
Farhad

INNAME     'SA43_EL15_F1'          Input UV file name (name)
AIPS 1: INCLASS    'APR1'                  Input UV file name (class)
AIPS 1: INSEQ         1                    Input UV file name (seq. #)
AIPS 1: INDISK        1                    Input UV file disk unit #
AIPS 1: UVRANGE       0        140000      Range of projected spacings
AIPS 1:                                      (thousands of wavelengths)
AIPS 1: TIMERANG   *all 0                  Time range to select:
AIPS 1:                                      Start Day, Hour, Min, Sec
AIPS 1:                                      End Day, Hour, Min, Sec
AIPS 1: SHIFT         0           0        1: source offset in RA (asec)
AIPS 1:                                    2: source offset in DEC
AIPS 1: FREQID        0                    Frequency ID number: 0 -> 1
AIPS 1: BCHAN         1                    First channel to include
AIPS 1: ECHAN         0                    Last channel to include
AIPS 1: BIF           1                    First IF to include
AIPS 1: EIF           1                    Last IF to include
AIPS 1: BPARM         5           5        Control parameters
AIPS 1:               0           0        1 : Correlator number
AIPS 1:               0           0.2      2 : averaging interval (sec)
AIPS 1:               1.2         0        3 : > 0.0 => fixed scale
AIPS 1:              -2           0            < 0.0 => fixed range
AIPS 1:                                    4 :



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