The proportionality factor corrects for systematically
different sensitivities of the photomultipliers in the fast
response O3 detectors. This allows a subsequent comparison of
the sensitivities from two different detectors when using
different sensor discs (e.g., BAGUS versus EAM8, see below).
The background noise of both analyzers was determined by
closing inlet and outlet tubes while sensor discs were installed.
The remaining background signal after O3 reacted completely
with the chemicals was subtracted from the highly timeresolved
O3 data.