SET QUALITY

        CLIC\SET QUALITY Q

    FIND  will select only observations of quality better than Q (i.e.  less
    than Q).  When originally written, unless the real time acquisition sys-
    tem detected a severe problem, all observations have quality 0, a priori
    the best. The quality flag of an observation can be  changed  using  the
    TAG command. See HELP TAG for the recommended quality scale.