  The ICARUS liquid argon time projection chamber (LArTPC) neutrino detector
has been taking physics data since 2022 as part of the Short-Baseline Neutrino
(SBN) Program. This paper details the equalization of the response to charge in
the ICARUS time projection chamber (TPC), as well as data-driven tuning of the
simulation of ionization charge signals and electronics noise. The equalization
procedure removes non-uniformities in the ICARUS TPC response to charge in
space and time. This work leverages the copious number of cosmic ray muons
available to ICARUS at the surface. The ionization signal shape simulation
applies a novel procedure that tunes the simulation to match what is measured
in data. The end result of the equalization procedure and simulation tuning
allows for a comparison of charge measurements in ICARUS between Monte Carlo
simulation and data, showing good performance with minimal residual bias
between the two.
