DCN E1000700-V4 THE CORRESPONDING FORMAL DRAWING TREE, WHICH INCLUDES A PROPER PURCHASING BOM, IS: LIGO-E1000699-V4 THE DCN INCORPORATES REVISIONS AS FOLLOWS: Made-to-spec items, drawing update: D1001517-V5, THE REVISION TABLE IS UPDATED AND NOTE 10 ADDED D1001521-v5, LENGTH OF ITEMS 5 & 6 ARE INCREASED TO 114" AND A FLANGED BACKSHELL IS USED AT JOINT 11, THE SEI INTERFACE