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We study the capability of INO-ICAL to determine the atmospheric neutrinooscillation parameters $|\Delta m^2_{31}|$ and $\sin^2 \theta_{23}$. We do notuse any generator level information. Instead, we process the generatedatmospheric neutrino events through GEANT4 simulation of the detector and theevent reconstruction framework. Among the outputs of this framework, only themomentum and direction of the longest track were used in a previous study byother authors. In this study, in addition to these variables, we consider athird variable based on additional hits, which arise due to hadrons in theevent. We show that the inclusion of the this variable leads to a 30% reductionin the uncertainties of $|\Delta m^2_{31}|$ for a 5-year run of ICAL. We findthat doubling the exposure time leads to a 30% reduction in the uncertaintiesof both $|\Delta m^2_{31}|$ and $\sin^2 \theta_{23}$.

Neutrino Oscillation parameter determination at INO-ICAL using track and hit information from GEANT