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We monitor 35, and we usually have a signal at 36 that correlates with the 35 signal (typically a few percent of the 35 in our system, and usually comes out with the blank correction). Of course, there are a couple of other ways to verify that it is Cl and HCl: the 37/35 is in roughly the Cl ratio (1:3), and there should be a signal at 38 that's in the same ratio to 36. Lately, we've often had a 35 signal that's not in that 3:1 ratio to 37, and while I presume it must be some hydrocarbon, I've never quite figured out how you can get a signal at that mass. Tim Timothy D. Swindle Lunar and Planetary Laboratory University of Arizona Tucson AZ 85721-0092 Phone: (520)-621-4128 Fax: (520)-621-4933