| check_wn_col | Check the Currently Set Wavenumber Column | 
| CoHAspec | CoHAspec Dataset | 
| demo_rolling_ball | Usage Example and Test | 
| plot_rolling_ball | Plot Rolling Ball Results | 
| rolling_ball | Rolling Ball Baseline Correction | 
| rolling_ball_morphology | Enhanced Rolling Ball with Mathematical Morphology | 
| set_spec_wn | Set the Default Wavenumber Column | 
| smooth_baseline | Baseline Smoothing | 
| spec_abs2trans | Convert Absorbance Data to Transmittance | 
| spec_blc_rollingBall | Apply Rolling Ball Baseline Correction to Spectral Data | 
| spec_bl_rollingBall | Extract Rolling Ball Baseline from Spectral Data | 
| spec_diff | Apply Differentiation to Spectral Data | 
| spec_filter | Filter spectral data by wavenumber range | 
| spec_norm_01 | Normalize Spectral Data to the [0, 1] Range | 
| spec_norm_minmax | Normalize Spectral Data to a Specified Range | 
| spec_norm_var | Standardize Spectral Data to Unit Variance | 
| spec_pca | Perform Principal Component Analysis (PCA) on Spectral Data | 
| spec_pca_screeplot | Scree plot for PCA results | 
| spec_pca_wn_contrib | Compute Wavenumber Contributions to Principal Components | 
| spec_read | Read Spectral Data from Various File Formats | 
| spec_select | Select Specific Columns in a Spectral Data Frame | 
| spec_smartplot | Create a Custom Plot for Spectral Data | 
| spec_smartplotly | Create an Interactive Plot for Spectral Data using Plotly | 
| spec_smooth_avg | Apply Smoothing to Spectral Data Using a Moving Average | 
| spec_smooth_sga | Apply Savitzky-Golay Smoothing to Spectral Data | 
| spec_trans2abs | Convert Spectral Data from Transmittance to Absorbance |