Fig. 2 e Comparison between an O2 switched passive
diffusion tube system and an active flushing system
adopted to the spinach container, which was subjected to
(A) a set O2 concentration control and (B) a set range control
of O2 concentrations at 10 C. Solid lines represent gas
concentration for the active flushing system, and dashed
lines represent that for the O2 switched passive diffusion
tube system.