UPDATE

 

        LAS\UPDATE

    Update the LAST version of the observation in the R buffer in the output
    file  ;  the  update OVERWRITES the observation. If more space is needed
    (e.g., the new  version  has  more  header  information),  an  error  is
    returned.   You  MUST  then  WRITE  the  observation  to  avoid  loss of
    information.  You can update only last versions.  This command  MUST  BE
    USED  WITH  CAUTION  ; in case of complex manipulations of observations,
    you may get confused and erase precious data.

    The only typical case where it may be used is in the following sequence:
        GET Number
        GAUSS or MODIFY
        UPDATE