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'.