1522_book.fm Page 194 Thursday, November 13, 2003 9:58 AM m/z minutes 106 12 102 100 11 91 10 90 9 80 77 8 70 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