apdefault
lower = -5., upper = 5.
Default lower and upper aperture limits relative to the aperture center.
These limits are used for apertures found with apfind and when
defining the first aperture in apedit.
apidtable =
Aperture identification table consisting of lines with an aperture number,
a beam number, and a title. This table is used to assign aperture
information automatically in apfind and apedit.
b_order = 1
Default background function order. The order refers to the number of
terms in the polynomial functions or the number of spline pieces in the spline
functions.
b_sample = -10:-6,6:10
Default background sample. The sample is given by a set of colon separated
ranges each separated by either whitespace or commas. The string "*" refers
to all points. Note that the background coordinates are relative to the
aperture center and not image pixel coordinates so the endpoints need not
be integer.
b_naverage = -3
Default number of points to average or median. Positive numbers
average that number of sequential points to form a fitting point.
Negative numbers median that number, in absolute value, of sequential
points. A value of 1 does no averaging and each data point is used in the
fit.
b_niterate = 0
Default number of rejection iterations. If greater than zero the fit is
used to detect deviant fitting points and reject them before repeating the
fit. The number of iterations of this process is given by this parameter.
b_low_reject = 3., b_high_reject = 3.
Default background lower and upper rejection sigmas. If greater than zero
points deviating from the fit below and above the fit by more than this
number of times the sigma of the residuals are rejected before refitting.
b_grow = 0.
Default reject growing radius. Points within a distance given by this
parameter of any rejected point are also rejected.
This task sets the values of the default aperture parameters for the
tasks apedit and apfind which define new apertures. For a
description of the components of an aperture see the paper The
APEXTRACT Package. In apedit the default aperture limits and
background parameters parameters are only used if there are no other
apertures defined. The aperture identification table is used when
reordering the apertures with the 'o' key. When run the parameters are
displayed and modified using the eparam task.
The aperture limits and background fitting sample regions are defined
relative to the center of the aperture. The background fitting parameters
are those used by the ICFIT package. They may be modified interactively
with the 'b' key in the task apedit. For more on background fitting
and subtracting see apbackground.
To review and modify the default aperture parameters:
cl> apdefault
apbackground,
apedit,
apfind,
icfit,
EXAMPLES
SEE ALSO
This page automatically generated from the iraf .hlp file. If you
would like your local iraf package .hlp files converted into HTML
please contact Dave Mills at NOAO.dmills@noao.edu