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• Id : ComPWA::ParticleProperties
• InitialEstimatorValue : ComPWA::FitResult
• InitialParameters : ComPWA::FitResult
• InitialState : ComPWA::Physics::ParticleStateTransitionKinematicsInfo
• InitialStateP4 : ComPWA::Physics::ParticleStateTransitionKinematicsInfo
• Integral : ComPWA::Tools::Plotting::DalitzHisto
• Intensity : ComPWA::Estimator::ChiOneD::ChiOneD , ComPWA::Estimator::MinLogLH , EnergyParameters
• IntensityGradientDataMapping : ComPWA::Tools::FitFractions
• IntQuantumNumbers : ComPWA::ParticleProperties
• IntValues : ComPWA::FunctionTree::ParameterList
• InvariantMassesSquared : ComPWA::Physics::HelicityFormalism::HelicityKinematics
• InvMassBounds : ComPWA::Physics::HelicityFormalism::HelicityKinematics
• IsFixed : ComPWA::FitParameter< T > , ComPWA::FunctionTree::FitParameter
• IsValid : ComPWA::FitResult