I switched the R2 gas line from the Hall C gas shed to the 65:35 premix tank by the doghouse.
Premix bottle was full (1400 psi, I think). The last bottle lasted for ~4 weeks at this flow rate. When the low-current/tracking work is done next week we should flip back to the gas shed mix. That way we'll have plenty of gas left for future tracking runs.
Gas flows to both R3 and R2 were verified after the interuption to swap gas lines. Looks like all chambers are bubbling through already.