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    By default, STITCH checks the consistency between all the input spectra.
    This  is a security to avoid mixing inconsistent data (e.g. spectra from
    different sources). These checks can be individually (with one  or  more
    names) or all (no name) disabled using the option /NOCHECK. See HELP SET
    NOCHECK for details.

    Note the key status of the SPECTROSCOPY check! STITCH uses this check to
    detect if the spectra frequency axes are aligned or not, to help its de-
    cision to enable resampling  or  not  (see  /RESAMPLE  subtopic).  Using
    /NOCHECK SPECTROSCOPY enforces the spectra alignment status:

        will  assume  the spectra are aligned and will stack them channel by
        channel (no resampling), while they are possibly not aligned.

        will assume the spectra are not aligned  and  will  always  resample
        them  before  stacking, even if not necessary (adds computation cost
        and possible round off errors).

Gildas manager 2019-02-19