1. Introduction  
2. Observational Data and Decomposition Method  
2.2. Hi-GAL  
2.3. The GaussPy$^+$ Algorithm  
3. Gaussian Decomposition of the GRS Data  
3.1. Catalogue Description  
3.2. Flux Recovery  
4. Statistics of the Gaussian Components  
4.1. Number of Fitted Components  
4.2. Intensity Values  
4.3. Centroid Velocity Values  
4.4. Velocity Dispersion Values  
4.5. Relationships Between the Parameters  
5. Global Properties of the Gas Emission  
5.1. Distribution of Velocity Dispersion Values as a Function of Galactic Coordinates  
5.2. Complexity Along the Line of Sight  
6. Example Application: Disentangling Emission from the Near and Far Side of the Galaxy  
6.1. Considerations Based on Galactic Kinematics  
6.2. Expected Location and Extent of the Galactic Disk  
6.3. Expected Velocity Dispersion Values  
6.4. Information Contained in the Velocity Dispersion Values  
7. Summary