LAS\SET ALIGN Type Range
Defines the way the spectra are aligned to be added together. Type may
be C[hannel], V[elocity] or F[requency] for spectra, C[hannel] or
P[osition] for drifts. The range may be I[ntersect] or C[omposite]. The
default is CHANNEL INTERSECT. This means that continuum drifts in
opposite directions are not properly added: ALIGN Position must be
specified for that.