16:50 Changed PaO2 to 93 (Ultimately about where it was before) 16:55 Changed PaCO2 to 355 to up flows to ~110. 17:13 Changed PaCO2 back to 325, and adjusted PaO2 to 89.4 This has brought FlWT and FlSP to between 96 and 98 sccm Not as high as the originally specced 110+_10, but almost there 17:2... starting cals late 17:35? set calint to 13 17:50 set calint to 10 18:03:05 Set CalInt to 50, deselected purging gas a 18:33-34 AO2 inlet breath test 1 18:35: 19:29:45 Switched to manual Cal to avoid cal over CBA. 19:38~ switched back to Auto cal Looks like O2 spiked dramatically, but briefly 19:52:00 Switched to Flight Plan 2 (170/430) 22:42 Have noted several o2 rises/CO2 dips that correspond with elevations in anthro tracers. So, not just an anthrop airmass Seems like this is probably a stratospheric fold. Given that values are quite depleted in CO2 (6-7 ppm, then 7-8 ppm, and seem to be getting larger) this may be not only strat air, but strat air entrained up from Southern Hemisphere. Fred helped think this through. 01:23-01:45 Stratospheric signature just about at 43kft. Got flask at 01:28; should have it 01:39:00-40 Inlet Breath Test on AO2 02:09 Forced cal while holding at 20kft But then started descending, so to manual control, 02:12 then cleared to 10kftand holding at 10kft, so set cal back on. Hopefully will still just get comparison with MLO in 02:24 Just as fricking LT finally finishes, still holding at 10Kft 02:25 Descending to 8500...