! Document name: half_window

!1/2_window

muly b
mulx a/2

cprism_ G_,H_,I_,
19,C_,
-1,0,15,
1,0,15,
 !1,e,15,
        1,c/b,13,         !VL 91/04/25
0.966,0.259,13,
0.866,0.5,13,
0.707,0.707,13,
0.5,0.866,13,
0.259,0.966,13,
0,1,13,
-0.259,0.966,13,
-0.5,0.866,13,
-0.707,0.707,13,
-0.866,0.5,13,
-0.966,0.259,13,
!-1,e,15,
         -1,c/b,13,         !VL 91/04/25
-1,0,8,
-1,1,8,
1,1,8,
1,0,8

end