Adding OI to the spectrum, I assume that the total OI 1304 emission
is equal to the total LBH. The shortest LBH
band is arount 1259, so I ignore all the emissions short of that point
to make that calculation. I also remove them
for the rest of this discussion. The resulting spectrum is plotted
below.
Convolving the filter sensitivity with the original spectrum, one gets a 'count rate' of 2006. Convolution with the spectrum with OI added results in 2324, an increase of 318 counts, or a 16% increase in count rate.