START08/pre-HIPPO RF03 Tropopause sampling due north to 62 N and over Rockies 16:03-25 Program hung 16:37 Lamp relit 17:11 Tightened trap fittings 19:33 Program hung 19:40 Closed program and restarted 19:47:40 Lamp relit Made 080424z.*r by catting 080424a.*r and 080424b.*r Deleted one line from 080424z.hr at 115.814550 (last line of 080424a.hr) Fridge trap inline, 16" u-traps, 1/2" main trap SP-WT Slope difference ~ 90 as a result of cross-port leak on changeover valve Inlet as 1/4" Synflex with first pressure control in rack - pressure/surface effect on O2 4-way in AFT position