NAME

lambda -- Print pixel values and wavelengths

USAGE

lambda input

PARAMETERS

input

Input spectum name. It can be any image template including @ lists. The input images should be one dimensional spectra.

start = "W0"

The name of the starting wavelengt keyword in the image header.

delte = "WPC"

The name of the wavelength increment keyword in the image header.

number = no

Print pixel number in the third column of the output ?.

convert = yes

Convert wavelengths in the image headers to Angstroms when they are in meters ? (i.e. when they are less than one).

DESCRIPTION

This task prints the pixel value, corresponding wavelength, and pixel number for all the pixels of the spectra specified in the input list. The ouput is a two or three column table with the wavelength in the first column, the pixel value in the second column, and optionally the pixel number in the third one. The last column is printed only if number=yes . The image name is printed at the begining of each output table. The output is written to the standard output and may be stored into a file by redirecting the output of the task. If an image cannot be opened, or if the wavelength keywords are not found in the header, it's skipped with a warning message. The wavelength parameters in the input image headers can be either in meters or Angtroms. The appropiate conversion factor will be used, according with the order of magnitude of the parameters, in order to always get Angstroms in the output table.

EXAMPLES

Get the pixel values and corresponding wavelength for the image test.imh and store it into a file called "wave". Finally, look at the first and last parts of the output file. This image has a starting wavelength of 3000 Angstroms, and a wavelength increment of 5.320002 Angstroms.

lo> lambda test.imh > wave
lo> head wave
image = test.imh

3000. 0.
3005.32 0.
3010.64 0.
3015.96 0.
3021.28 0.
3026.6 2387.733
3031.92 2387.733
3037.24 2568.792

lo> tail wave
5904.72 48252.54
5910.04 48451.05
5915.36 48559.14
5920.68 48507.7
5926. 48318.09
5931.32 48194.57
5936.64 48170.33
5941.96 48061.23
5947.28 48209.77
5952.6 48144.27

SEE ALSO

onedspec.dispcor