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Basic Information on imspect
Task: imspect
Purpose: Make spectrum from a Miriad image.
Categories: image analysis and display.
IMSPECT makes an spectrum of the velocity or frequency axis of a
Miriad image. The spectrum is integrated, or averaged over the
region specified for the other image axes. The output spectrum
can be plotted and/or written out as an ascii file for further
analysis.
Key: in
The input image. vxy and xyv images are acceptable inputs.
No default.
Key: region
Rectangular region of image to be averaged. E.g.
% imspect region=relpix,box(-4,-4,5,5)(10,50) for an xyv
image, makes a spectrum of image planes 10 to 50 integrated
over the center 10 x 10 pixels in the x-y plane. For a vxy
image where the x and y size is 128x128, the corresponding
region=box(10,61,50,70)(61,70). Box refers image axes 1 and 2
for either vxy or xyv images. The default is the entire image.
Key: xaxis
The x-axis can be plotted as 'channel' or the units in the image.
The default which is whatever units are in the header.
Key: yaxis
If 'average' then the pixels enclosed in the x-y area specified
are averaged. If 'sum' they are summed and normalized if the units
are known. Default is 'average'
Key: yrange
Y-axis range for plot. The default is to self-scale.
Key: hann
Hanning smoothing length (an odd integer < 15). The default is
no smoothing (hann = 1).
Key: options
List of minimum match task enrichment options.
1deriv Take 1-sided derivative of spectrum before plotting
and after Hanning smoothing. Useful for Zeeman enthusiasts.
2deriv Take 2-sided derivative of spectrum before plotting.
curve Plot the spectrum joining up the dots instead of the
default step-plot.
Key: device
Standard PGPLOT device. See the help on device for more information.
Key: log
Write spectrum to this ascii file. Default is no output file.
Key: comment
A one-line comment which is written into the logfile.