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| extracts redshifts and velocity dispersions using cross correlation methods
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| finds redshifts using emission line shifts
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| sets parameters for continuum removal in xcsao and emsao
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| computes equivalent widths for rest-wavelength-specified spectral lines
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| creates an artificial spectrum from a list of spectral lines (added in 2.0)
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| sums spectra to create a composite spectrum (added in 2.0)
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| sets parameters for continuum removal in sumspec
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| sets barycentric velocity correction for non-standard header parameters
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| list pixel, wavelength, and value of specified piece of a spectrum
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| return the number of the pixel in a spectrum which corresponds to a
specified wavelength
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| return the wavelength of a specified pixel in a spectrum
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| sets values in the parameter file of the new version
of a task from the current values.
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