1522_book.fm Page 194 Thursday, November 13, 2003 9:58 AM 106 102 91 77 70 m/z 100 90 80 minutes 12 11 10 9 8 7 65 6 60 MS/MS spectrum of m-xylene. 5 51 50 4 40 © 2004 by CRC Press LLC 100% 75% 50% 25% 0% kCounts 40 30 20 10 Figure 5.8