[daip] POSSM question
Hanno Spreeuw
spreeuw at astron.nl
Tue Nov 13 09:38:38 EST 2007
Hello, by accident I ran POSSM with sour ''.
The scalar averaged cross power spectrum seems to show a "comb" of very
strong RFI that I cannot reproduce by specifying each of the sources in
the multi-source file individually. Each of the individual sources show
hardly any RFI.
This is P-band data, the "comb" is usually seen in 4-band.
I am not sure what POSSM shows when sour=''.
Do you know?
Thanks,
Hanno.
PS: this is AIPS07 with the MNJ.
>inp
AIPS 6: POSSM Task to plot total and cross-power spectra.
AIPS 6: Adverbs Values Comments
AIPS 6: ----------------------------------------------------------------
AIPS 6: USERID 0 User number
AIPS 6: INNAME 'STEPBYSTEP' Input UV file name (name)
AIPS 6: INCLASS 'UVCOP' Input UV file name (class)
AIPS 6: INSEQ 6 Input UV file name (seq. #)
AIPS 6: INDISK 1 Input UV file disk unit #
AIPS 6: SOURCES *all ' ' Source list
AIPS 6: QUAL -1 Source qualifier -1=>all
AIPS 6: CALCODE ' ' Calibrator code ' '=>all
AIPS 6: SELBAND -1 Bandwidth to select (kHz)
AIPS 6: SELFREQ -1 Frequency to select (MHz)
AIPS 6: FREQID -1 Freq. ID to select.
AIPS 6: UVRANG 0 0 UV range to be plotted
AIPS 6: TIMERANG *all 0 Time range to be plotted
AIPS 6: STOKES ' ' Stokes type(s) to select.
AIPS 6: BIF 0 Lowest IF number 0=>all
AIPS 6: EIF 0 Highest IF number 0=>all
AIPS 6: BCHAN 1 Lowest channel number 0=>all
AIPS 6: ECHAN 0 Highest channel number 0=>all
AIPS 6: SUBARRAY 0 Subarray, 0=>1
AIPS 6: ANTENNAS *all 0 Antennas to select
AIPS 6: BASELINE *all 0 Baselines with ANTENNAS
AIPS 6: DOCALIB 2 > 0 calibrate data & weights
AIPS 6: > 99 do NOT calibrate weights
AIPS 6: GAINUSE 3 CL (or SN) table to apply
AIPS 6: DOPOL -1 If >0 correct polarization.
AIPS 6: BLVER -1 BL table to apply.
AIPS 6: FLAGVER 1 Flag table version
AIPS 6: DOBAND 1 If >0 apply bandpass cal.
AIPS 6: Method used depends on value
AIPS 6: of DOBAND (see HELP file).
AIPS 6: BPVER 9 Bandpass table version
AIPS 6: SMOOTH *all 0 Smoothing function. See
AIPS 6: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 6: HELP SMOOTH for details.
AIPS 6: SHIFT 0 0 Position shift:
AIPS 6: RA, Dec (arcsec)
AIPS 6: 0 => no shift
AIPS 6: APARM *all 0 Control information:
AIPS 6: 1: = 0 => scalar average
AIPS 6: > 0 => vector average
AIPS 6: 2: = 0 => self-scale
AIPS 6: > 0 => fixed scale
AIPS 6: (use APARM(3-6))
AIPS 6: 3: min. amplitude
AIPS 6: 4: max. amplitude
AIPS 6: 5: min. phase (degrees)
AIPS 6: 6: max. phase
AIPS 6: 7: x-axis labelling
AIPS 6: = 0 = > in channels.
AIPS 6: = 1 = > in Hz (or secs
AIPS 6: if corr. fn)
AIPS 6: = 2 = > in m/s
AIPS 6: 8: = 0 => plot cross power
AIPS 6: = 1 => plot total power
AIPS 6: = 2 => plot BP table
AIPS 6: = 3 => plot ACF
AIPS 6: = 4 => plot XCF
AIPS 6: = 5 => plot cross power of
AIPS 6: individual antennas
AIPS 6: for cross polaris.
AIPS 6: (STOKES=RL, or LR)
AIPS 6: 9: > 0 => plot several IF's
AIPS 6: and/or polarizations
AIPS 6: together as though one
AIPS 6: long spectrum (see HELP)
AIPS 6: 10: > 0 => reverse direction
AIPS 6: of plotted spectrum, so
AIPS 6: velocity increases to
AIPS 6: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 6: right.
AIPS 6: CODETYPE ' ' 'A&P ', 'AMP ', 'PHAS',
AIPS 6: 'R&I ', 'REAL', 'IMAG'
AIPS 6: other => 'A&P '
AIPS 6: POLPLOT ' ' Option to display various
AIPS 6: combinations of polzns to
AIPS 6: plot: 'RL/RR', 'RL/LL',
AIPS 6: 'LR/RR', 'LR/LL', 'RR/LL'
AIPS 6: 'LL/RR'; other = don't use
AIPS 6: this option.
AIPS 6: SOLINT 0 If SOLINT > 0 then it enables
AIPS 6: the user to make multiple
AIPS 6: plots per pass of POSSM.
AIPS 6: It defines the averaging time
AIPS 6: for each individual plot.
AIPS 6: Task will start at TIMERANG
AIPS 6: and make a plot for every
AIPS 6: SOLINT minutes. If SOLINT
AIPS 6: = -1 will do the same but
AIPS 6: will do scan averages if NX
AIPS 6: table is present.
AIPS 6: NPLOTS 6 Number of plots per page
AIPS 6: BPARM *all 0 More control information:
AIPS 6: 1: If = 1 divide by 'channel
AIPS 6: 0' before plotting data.
AIPS 6: 0 => do not divide.
AIPS 6: 2: Start chn. of 'channel 0'
AIPS 6: (0 => determined by POSSM)
AIPS 6: 3: Stop chn. of 'channel 0'
AIPS 6: (0 => determined by POSSM)
AIPS 6: 4: ignore spectrum when ampl.
AIPS 6: channel 0 < BPARM(4) Jy
AIPS 6: 5-9: unused
AIPS 6: 10: =1 => don't write header
AIPS 6: info when writing to outfile
AIPS 6: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 6: useful for appending several
AIPS 6: spectra into a single outfile
AIPS 6: [see EXPLAIN POSSM]
AIPS 6: OUTFILE ' '
AIPS 6: Filename in which to write
AIPS 6: spectrum. Default = ' ' =
AIPS 6: do not write spectrum. The
AIPS 6: file is written only if
AIPS 6: NPLOTS = 0
AIPS 6: LTYPE 3 Type of labeling: 1 border,
AIPS 6: 2 no ticks, 3 - 6 standard,
AIPS 6: 7 - 10 only tick labels
AIPS 6: <0 -> no date/time
AIPS 6: FACTOR 0 Scale plus signs by FACTOR
AIPS 6: XYRATIO 0 XY plot ratio: 0 -> 1.636
AIPS 6: BADDISK *all 0 Disks to avoid for scratch
AIPS 6: DOTV 1 > 0 Do plot on the TV, else
AIPS 6: make a plot file
AIPS 6: GRCHAN 0 Graphics channel 0 => 1.
>tvini
>go
AIPS 6: Resumes
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