[0] = worst error severity

Reading ett-rev-Ai.sil
;File=ett-rev-Ai.sil Rev=Ai Date=10/01/82 Page=00 Reference  MARKED BUILT 
Reading ett03.sil
;File=ETT03.sil Rev=Ai Date=10/01/82 Page=03  MARKED BUILT 
Reading ett07.sil
;File=ETT07.sil Rev=Ai Date=10/01/82 Page=07  MARKED BUILT 
Reading ett09.sil
;File=ETT09.sil Rev=Ai Date=10/01/82 Page=09  MARKED BUILT