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    FOLD copies R into T, and folds a (not  yet  folded)  frequency-switched

    The  behavior regarding blank values (contaminating or not the resulting
    spectrum) is ruled by the SET BAD tuning (see HELP SET BAD for details).
    If  blank  channels  are located at the folded spectrum boundaries, they
    can be kept (/BOUNDARIES KEEP) or implictly dropped (/BOUNDARIES  DROP).
    Default is KEEP.

    Because of the frequency throw, there are frequencies which are not cov-
    ered by all phases (R%HEAD%FSW%NPHAS), typically 1 phase instead  of  2.
    The  resulting  channels in the folded spectrum are located at the spec-
    trum boundaries. If SET ALIGN second argument is Intersect  (resp.  Com-
    posite),  those  channels  are rejected from (resp. included in) the re-
    sulting R spectrum. Default is Intersect.

Gildas manager 2019-04-25