= Digital optical module
A glass-enclosed <photomultiplier> with local digitization: pulse times and charges enter event reconstruction. Reciprocal electrical pulses synchronize module clocks to the surface time base.<The IceCube Neutrino Observatory: Instrumentation and Online Systems by IceCube Collaboration>[Sections 2.1, 3.3: module and reciprocal timing]{ref}
<Weak charged current> interactions of <muon neutrinos> usually give extended <muon> tracks. Compact <particle showers> occur in other channels, including <weak neutral current> interactions of every <neutrino flavor>. Tracks generally constrain direction better; escaping <particles> complicate <energy> inference.<The IceCube Neutrino Observatory: Instrumentation and Online Systems by IceCube Collaboration>[Section 1.1.1: tracks and showers]{ref}
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