QCcorrectionLOESS       Generate values for metabolites normalization
QCcorrectionMultiLOESS
                        Generate values for metabolites normalization
QCcorrectionMultiPoly3
                        Generate values for metabolites normalization
QCcorrectionMultiPoly4
                        Generate values for metabolites normalization
QCcorrectionMultiPoly6
                        Generate values for metabolites normalization
QCcorrectionSinglePoly3
                        Generate values for metabolites normalization
QCcorrectionSinglePoly4
                        Generate values for metabolites normalization
QCcorrectionSinglePoly6
                        Generate values for metabolites normalization
QCregression            Equation to be used internally to predict
                        values from a regression curve of grade 3
QCregression4           Equation to be used internally to predict
                        values from a regression curve of grade 4
QCregression6           Equation to be used internally to predict
                        values from a regression curve of grade 6
graphQC                 Representate the compounds area (normalized or
                        not) as a function of their injection order to
                        study trends.
