The optimization of ZA Vs NPE (using NPE distribution) (corsika and observational data (proton))

NPE shift factor: 1.70	NPE shift factor: 1.75	NPE shift factor: 1.80	NPE shift factor: 1.82
NPE shift factor: 1.84	NPE shift factor: 1.85	NPE shift factor: 1.86	NPE shift factor: 1.88
NPE shift factor: 1.90	NPE shift factor: 1.95	NPE shift factor: 2.00