This predetermined angle may assist in forcing {HEAD ~ the movable window panel} closer to {TAIL ~ a fixed window panel} when the window opening is closed 
closer to
This predetermined angle may assist in forcing { HEAD ~ the movable window panel } closer to { TAIL ~ a fixed window panel } when the window opening is closed
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH