Reading a window without opening a world
Five observations use the same optical path. Oxygen is reported as dry-gas volume percent; the algal channel is optical density at 680 nm. The operator checks an external reference and visible window fouling before reading. A failed reference makes the channel unavailable.
The weekly observations form a sparse record of one chamber, unable to resolve every lighting-cycle fluctuation. The packet has no repeated calibration measurements and supplies no error bars. No optical-density-to-dry-mass calibration is supplied.