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UV_PREVIEW cannot identify lines if there are two few channels. It will
only display the spectra in this case. A minimum of 32 channels is required,
but confused spectra may also prevent a proper line recognition.
The line detection is based on the current specified velocity. If this is
incorrect, lines may appear shifted and considered as not detected. PRE-
VIEW%TOLERANCE indicates the matching precision in frequency (default is 2
MHz).
If variable \sicvar{REDSHIFT} exists, the frequency scale is corrected for
that source Redshift, so that line identification remains possible.