         }
         columns.append(contentsOf: [
             keyColumnGammaEnergy,
+            keyColumnGammaEncoder,
             keyColumnGammaDeltaTime
             ])
         if criteria.searchSpecialEvents {

        let name = "\(position)\(encoder)"
        let energy = calibration.calibratedValueForAmplitude(Double(channel), eventName: name)
        let info = [kEnergy: energy,
                    kDeltaTime: deltaTime] as [String : Any]
        gammaPerAct.append(info)
    }

    fileprivate var keyColumnNeutrons = "Neutrons"
    fileprivate var keyColumnNeutronsBackward = "Neutrons(Backward)"
    fileprivate var keyColumnGammaEnergy = "Gamma"
    fileprivate var keyColumnGammaEncoder = "GammaEncoder"
    fileprivate var keyColumnGammaDeltaTime = "dT($Fron-Gamma)"
    fileprivate var keyColumnSpecial = "Special"
    fileprivate func keyColumnSpecialFor(eventId: Int) -> String {
