1. Introduction

2. Observations
2.1. Target list
2.2. Instrument and instrument settings
2.3. Observing strategy and data reduction
2.4. Correction for the chromatism of the retarder waveplate and for instrumental polarisation

3. Analysis

4. Results

5. Quality checks
5.2. Consistency with previous work

6. Discussion
6.1. Galactic polarisation map
6.2. Relationships between the best-fit parameters K and λmax of the Serkowski curve
6.3. Relationships between λmax, Pmax and the extinction
6.4. Comments on special cases

7. Conclusions