The experimental data sample is reduced to 263,000 events, or 6.5% of the initial sample.
Using data from the combined SPASE-AMANDA experiment, a similar trend to heavier primaries at higher energies is seen [29].
To investigate the sensitivity of the analysis to the composition of the primary cosmic rays, the proton and iron content was varied between 0% and 100%.
Allowing a minimum of 20% of protons or iron as extremes decreases the uncertainty to about 15%, the value used in this analysis.
The variation of the optical properties leads to the largest error of 34%, the absolute sensitivity of the OM contributes 15%, the neutrino cross section 8% and the muon propagation 6%.
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