1. Introduction

2. Observations
2.1. 490–1850 GHz Herschel/HIFI spectroscopy
2.2. Ground-based (sub)-millimeter spectroscopy

3. Observational results

4. Envelope spectral line energy distribution model
4.1. Model setup
4.2. Comparison of model results with observations

5. Physical conditions per component
5.1. Foreground clouds
5.2. Outflow gas

6. Discussion and conclusions
6.1. Envelope structure
6.2. Foreground clouds
6.3. Outflow gas
6.4. Compact HCN emission