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****  osetup
 size 20. 6.
 opt ntic
 null 0. 1. 0. 1. ab
 selnt 1
 
 
 set fais 1
 set faci 1
 set lwid 4.
 set chhe 0.5
 set txfp -20
 igset ltyp 1
 
 arline 1. 3. 5. 3. 0.4
 fpoint 5. 3. 0.1
 helix  5. 3. 7. 2.5 0.3 4. 0.
 arline 7. 2.5 9. 1.7 0.4
 igset ltyp 2
 arline 7. 2.5 9. 3.3 0.4
 arline 5. 3. 9. 5. 0.4
 itx 0.35 2.8 [t]^-
 itx 9.35 4.8 [n]?[t]!
 itx 9.35 3.1 [n]&^[\276]!?e!
 itx 9.35 1.5 e^-
 itx 5.3 1.4 W^-