Appac-class             Fitted APPAC model
Compensation-class      Drift / daily-factor model
Correction-class        Pressure correction model
PLOT_FID                Flame-ionization-detector peak areas for APPAC
Synth_data              Synthetic stress-test data for APPAC
appac                   Fit the APPAC pressure correction
check_cols              Validate and canonicalise the input columns
debias_ct               De-bias the per-peak centres
get_changepoints        Detect episode level breakpoints across
                        cylinders
get_variance_changepoints
                        Detect variance breakpoints across cylinders
goodness_of_fit         Goodness of fit of the correction
plot_area_date          Plot peak area versus date
plot_area_pressure      Plot peak area versus air pressure
plot_area_pressure_fit
                        Plot the kappa-fit input
plot_residuals          Residual diagnostic panel
