IGNORE

        LAS\IGNORE List_of_Observations [/SCAN iscan]

    This command can be used to declared the specified list of  Observations
    (from the INPUT file) to be ignored in all FIND operations.  They effec-
    tively become invisible to CLASS (except in a LIST IN command), until  a
    FILE  IN  command is typed again. The input file is not physically modi-
    fied however. The list of observation may have the same  format  as  the
    index list of a FOR command.

    /SCAN iscan
        Ignore all observations with scan number 'iscan'.