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This commit updates the PMT response bank and absorption lengths for H2O and
D2O based on the values in mcprod which were used for the LETA analysis.
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Previously I was interpolating the absorption lengths using interp1d() but that
only works when the x array is uniform. Since the wavelengths are not spaced
uniformly, we have to use the GSL interpolation routines.
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the quantum efficiency
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This commit updates get_absorption_length_snoman_d2o() and
get_absorption_length_h2o() to use absorption lengths from SNOMAN. Currently
I'm just using the values from prod/media.dat but there are other media files
in that directory that have values that seem to be actually measured using
in-situ measurements (for example media_qoca_*.dat). I'm not 100% sure which
ones to use so I am adding the default ones for now.
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This commit adds the absorption length to the likelihood calculation. For now
I'm just using a single number independent of wavelength. I should update this
in the future to actually use the absorption lengths as measured by SNO and
then calculate an overall absorption length weighted by the Cerenkov spectrum
and the PMT quantum efficiency.
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