	 1 8 L B   +   1 7 L B 	 	 	 	 	 	 
 
 C o n c e n t r a t i o n   /   u M 	 	 	 R a w   p e a k   a r e a s 	 	 	 	 
 
 1 7 L B 	 1 8 L B 	 r a t i o 	 M 1 7 L B 	 M 1 8 L B 	 D 1 7 L B 	 H e t 1 7 L B / 1 8 L B 	 D 1 8 L B 
 
 2 0 	 5 0 	 0 . 4 	 0 . 2 8 3 	 0 . 1 5 3 	 0 . 0 6 0 	 0 . 0 5 4 	 0 . 4 5 1 
 
 2 0 	 4 5 	 0 . 4 4 4 4 4 4 4 4 4 	 0 . 3 5 6 	 0 . 1 7 5 	 0 . 0 4 5 	 0 . 0 3 9 	 0 . 3 8 5 
 
 2 0 	 4 0 	 0 . 5 	 0 . 4 4 5 	 0 . 1 3 5 	 0 . 0 3 1 	 0 . 0 3 1 	 0 . 3 5 7 
 
 2 0 	 3 5 	 0 . 5 7 1 4 2 8 5 7 1 	 0 . 3 7 4 	 0 . 1 1 5 	 0 . 0 2 5 	 0 . 0 2 9 	 0 . 4 5 7 
 
 2 0 	 3 0 	 0 . 6 6 6 6 6 6 6 6 7 	 0 . 5 0 6 	 0 . 1 5 7 	 0 . 0 3 8 	 0 . 0 3 0 	 0 . 2 7 0 
 
 2 0 	 2 5 	 0 . 8 	 0 . 4 8 5 	 0 . 1 7 0 	 0 . 0 4 1 	 0 . 0 3 3 	 0 . 2 7 1 
 
 2 0 	 2 0 	 1 	 0 . 5 7 7 	 0 . 1 2 0 	 0 . 0 5 1 	 0 . 0 3 2 	 0 . 2 2 1 
 
 2 0 	 1 5 	 1 . 3 3 3 3 3 3 3 3 3 	 0 . 6 2 0 	 0 . 0 8 7 	 0 . 0 3 0 	 0 . 0 1 9 	 0 . 2 4 4 
 
 2 0 	 1 0 	 2 	 0 . 6 4 1 	 0 . 0 9 8 	 0 . 0 8 3 	 0 . 0 3 2 	 0 . 1 4 7 
 
 2 0 	 5 	 4 	 0 . 8 6 4 	 0 . 0 4 9 	 0 . 0 4 7 	 0 . 0 0 0 	 0 . 0 4 1 
 
 2 0 	 3 	 8 	 0 . 9 2 6 	 0 . 0 0 0 	 0 . 0 7 4 	 0 . 0 0 0 	 0 . 0 0 0 