AIPS HELP file for ELFIT in 31DEC24
As of Thu Apr 18 15:57:48 2024
ELFIT: Fit selected contents of an SN, SY, TY, PC or CL file
INPUTS
INNAME UV data (name).
INCLASS UV data (class).
INSEQ 0.0 9999.0 UV data (seq. #). 0 => high
INDISK 0.0 9.0 Disk unit #. 0 => any
INEXT Input 'SN','TY','PC', 'CL'
' ' -> 'SY'
INVERS Input table file version no.
SOURCES Source list
QUAL -10.0 Source qualifier -1=>all
TIMERANG Time range to plot
STOKES Stokes type to plot: R, L,
RR, LL, RRLL,
V, H, VV, HH, VVHH
SELBAND Bandwidth to plot (kHz)
SELFREQ Frequency to plot (MHz)
FREQID Freq. ID to plot, -1=>all
SUBARRAY -1.0 Limit to subarray; 0 -> 1
-1 -> all
BIF 0.0 100.0 First IF to plot, 0=>1.
EIF 0.0 100.0 Last IF to plot 0 -> highest
ANTENNAS Antennas to plot 0=>all
PIXRANGE Range to plot: 0 => self
scale each antenna separately
NPLOTS 0.0 28.0 Number of plots per page
ORDER 0.0 8.0 Order of polynomial to be
fit individually to each plot
OPTYPE Data to be plotted:
'PHAS','AMP ','DELA','RATE',
'TSYS','SUM ','DOPL','SNR ',
'MDEL','TANT','ATM ','GEO ',
'CCAL','DDLY','REAL','IMAG',
'IFR ','PDIF','PSUM','PGN ',
'PON ','POFF','PSYS','PDGN',
'PSGN','POWR','PODB','MULT'
' '=phase
DO3COLOR -1.0 2.0 DO3COL=2 => color by source
BCOUNT If INEXT ='PC' and OPTYPE =
'AMP' or 'PHAS, BCOUNT
specifies the phase cal tone
number to be plotted. 0->1.
XAXIS -6.0 6.0 Variable data is to be fit
against, 0=>elevation
< 0 -> plot full range
SYMBOL 0.0 24.0 Plot symbol number: 1 - 24
FACTOR -10.0 10.0 Scale plot symbols by FACTOR
<0 => connect points too
DOBLANK -1.0 24.0 > 0, show blanked values with
symbol type DOBLANK
CUTOFF Table weights <= CUTOFF will
not be plotted, flagged data
are not plotted.
LTYPE -410.0 410.0 Type of labeling: 1 border,
2 no ticks, 3 - 6 standard,
7 - 10 only tick labels
<0 -> no date/time
DOTV -1.0 1.0 > 0 Do plot on the TV, else
make a plot file
GRCHAN 0.0 8.0 Graphics channel
APARM (1) > 0 -> extrapolate XAXIS
1 and 2 types
WEIGHT = APARM(1)
(2) fiducal point 1
(3) fiducal point 2
HELP SECTION
ELFIT
Type: Task
Use: Plots selected calibration data versus time from a specified SN,
TY, PC or CL table. It then fits polynomials in the x-axis
parameter to the values.
To examine SN or CL tables with a new reference antenna, run
SNREF with DOKEEP=1 and then use ELFIT. Moving sources are
supported if a PO table is attached.
Adverbs:
INNAME.....UV file name (name). Standard defaults.
INCLASS....UV file name (class). Standard defaults.
INSEQ......UV file name (seq. #). 0 => highest.
INDISK.....Disk unit #. 0 => any.
INEXT......'SN','TY, 'PC', 'SY', or 'CL' table to be plotted
INVERS.....Version number of table to plot, 0=>highest no.
SOURCES....Source list. '*' = all; a "-" before a source name means
all except ANY source named.
QUAL.......Only sources with a source qualifier number in the SU table
matching QUAL will be used if QUAL is not -1.
TIMERANG...Time range of the data to be plotted. In order: Start day,
hour, min. sec, end day, hour, min. sec. Days relative to
reference date. The X-axis is plotted over the range of
X values found in the data. All plots in a given
execution will be on the same X scale in any case.
STOKES.....The desired Stokes type of the displayed data:
'R' = RCP, 'L' = LCP, 'RL' or 'RRLL' both RCP and LCP
'V' = VLP, 'H' = HLP, 'VH' or 'VVHH' both VLP and HLP
SELBAND....Bandwidth of data to be selected. If more than one IF is
present SELBAND is the width of the first IF required.
Units = kHz.
SELFREQ....Frequency of data to be selected. If more than one IF is
present SELFREQ is the frequency of the first IF required.
Units = MHz.
FREQID.....Frequency identifier to select (you may determine which is
applicable from the OPTYPE='SCAN' listing produced by
LISTR). If either SELBAND or SELFREQ are set, their values
overide that of FREQID. However, setting SELBAND and
SELFREQ may result in an ambiguity. In that case, the task
will request that you use FREQID. -1 => all, 0 => first
SUBARRAY...Limit display to specific subarray. -1 -> all, 0 -> 1.
BIF........First IF IF to plot
EIF........Last IF to plot.
If OPCODE = 'IFDF'/'IFRA' will plot difference/ratio of
specified quantity between BIF and EIF.
ANTENNAS...A list of the antennas to be plotted. All 0 => all. If any
number is negative then all antennas listed are NOT to be
plotted and all others are.
PIXRANGE...If PIXR(1) < PIXR(2), all plots will be from PIXR(1) to
PIXR(2). Otherwise each plot will be self-scaling.
NPLOTS.....Number of antennas to plot per page (try 5).
ORDER......Order of polynomial to be fit (0 - 6)
OPTYPE.....Data to be plotted:
1. 'PHAS' = phase,
2. 'AMP ' = amplitude,
3. 'DELA' = singleband delay (SN & CL)
4. 'RATE' = rate (SN, CL & PC)
5. 'TSYS' = sys. temp. (TY) (for VLA is nominal
sensitivity)
7. 'DOPL' = doppler offset (CL)
8. 'SNR' = signal/noise (SN & CL)
9. 'MDEL' = multiband delay (SN & CL)
10. 'TANT' = ant. temp. (TY) (for VLA either back- or
front-end system temperature)
11. 'ATM' = atm. delay (CL)
12. 'GEO' = geometric delay (CL)
13. 'CCAL' = cable cal (PC)
14. 'DDLY' = dispersive delay (SN & CL)
15. 'REAL' = real part
16. 'IMAG' = imag part
17. 'IFR ' = Ionospheric Faraday rotation (affects pol
cal) (SN & CL)
18. 'PDIF' = EVLA Gb * (Pon - Poff) (SY)
19. 'PSUM' = EVLA Gb * (Pon + Poff) (SY)
20. 'PGN ' = EVLA post sync-detector gain = Gb (SY)
21. 'PON ' = EVLA Pon (noise tube on) (SY)
22. 'POFF' = EVLA Poff (noise tube off) (SY)
Note that PON and POFF give numbers smaller
than PDIF and PSUM by the factor Gb which
is, by default, 512 and usually ranges in
the 400's when it has been set.
23. 'PSYS' = EVLA PSUM/PDIF/2 * Tcal (=Tsys) (SY)
uses values from the CD table
24 'PDGN' = EVLA Pdif / (4096 * Pgain * Pgain)
25 'PSGN' = EVLA Psum / (4096 * Pgain * Pgain)
26. 'POWR' = (1/Gain amp)^2
27. 'PODB' = Log10 (1/Gain amp)^2
' ' => 'PHAS'
. 'MULT' => plot multiple types as listed in APARM
using the type numbers given above.
DO3COLOR...DO3COL = 2 tells ELFIT to separate the plotted points
with color representing source. The list of source
numbers actually occurring in the table, time range,
source list, et al. is translated into consecutive
integers (in the same order) and then assigned red
through dark blue. Thus source numbers 1,2,3,10 become
4 equally spaced colors (red, yellow, cyan, blue).
<= 0 => use line type 4 for all points plotted.
BCOUNT.....If INEXT ='PC', and OPTYPE = 'AMP' or 'PHAS' then BCOUNT
specifies the phase cal tone number to be plotted. 0 -> 1.
XAXIS......Variable data is to be plotted against. 0 => 2
= 1 => Antenna zenith angle -1 plot 0 - 90 xenith ang
= 2 => Antenna elevation -2 plot 0 - 90 elevation
= 3 => Hour angle -3 plot -180 180 HA
= 5 => Parallactic angle -5 plot -180 180 Parang
= 6 => Antenna azimuth -6 plot 0 360 azimuth
Minus signs cause plots to cover full possible range
SYMBOL.....Choices are
1: Plus sign 13: Star of David
2: Cross (X) 14: Seven-pointed star
3: Circle 15: Eight-pointed star
4: Box 16: Nine-pointed star
5: Triangle 17: Ten-pointed star
6: Diamond 18: 11-pointed star
7: Pentagon 19: 12-pointed star
8: Hexagon 20: 13-pointed star
9: Septagon 21: 14-pointed star
10: Octagon 22: Plus (+) with gap
11: Nine-gon 23: Cross (X) with gap
12: Five pointed star 24: Vertical line
FACTOR.....Scale plot symbols by FACTOR 0 -> 1.
If FACTOR < 0, draw lines between the points and use
abs(FACTOR) to scale the points plotted.
DOBLANK....> 0 => plot blanked solutions with a symbol of type
DOBLANK (see symbol types above). They will be plotted
along the lower edge of each plot. NOTE: if DOTV true
and GRCHAN 0 and DO3COL <= 0, then the blanked samples
will be in the color of graphics channel 3 (pink) and the
good samples in the color of graphics channel 4 (blue).
DOBLANK > 0 is forced to be different than SYMBOL by
adding 1.
CUTOFF.....If >= 0, the task will examine the weight column of the
table and if the weight <= CUTOFF, the task will not plot
that sample. If = 0, will plot all good points; flagged
data are not plotted. CUTOFF is ignored for TY and PC
tables and OPTYPEs MDEL, ATM, GEO, and CCAL.
LTYPE......Labelling type, see HELP LTYPE for details:
1 = border, 2 = no ticks, 3 or 7 = standard, 4 or 8 =
relative to ref. pixel, 5 or 9 = relative to subimage
(BLC, TRC) center, 6 or 10 = pixels. 7-10 all labels
other than tick numbers and axis type are omitted.
Less than 0 is the same except that the plot file
version number and create time are omitted.
Add n * 100 to alter the metric scaling.
DOTV.......> 0 => plot directly on the TV device, otherwise make a
plot file for later display on one or more devices
(including the TV if desired).
GRCHAN.....Graphics channel (1 - 7) to use for line drawing.
A value of 0 causes more than one graphics channel to be
used.
APARM......(1) If > 0, the data for XAXIS 1 and 2 is extrapolated to
zenith angle 0 or elevation 90 weighting the 3
samples with APARM(1)
(2) Fiducial point 1 - if XAXIS 1 (zenith angle) is low
value default 20, if XAXIS 2 (elevation) is high
value default 70
(3) Fiducial point 2 - if XAXIS 1 (zenith angle) is high
value default 80, if XAXIS 2 (elevation) is low value
default 10.
For these 2 types only, the model is evaluated at the two
fiducial points and printed along with the model
parameters and the difference of the fit at point 2 minus
that at point 1.
EXPLAIN SECTION