1. Introduction

2. Observations
2.1. Instruments
2.2. Sample
2.3. Interferometric data
2.4. Photometry

3. Data processing
3.1. Model fits of the spectral energy distribution
3.2. Interferometric data: at first glance
3.3. Parametric model fitting: general methods
3.4. Size-flux degeneracy
3.5. Ellipsoids
3.6. Ring
3.7. Power law with inner boundary

4. Analysis and discussion
4.1. Dust temperatures
4.2. Overcoming some limitations of parametric fits via substitution weighing
4.3. Is there evidence for ring structure?
4.4. Do we see azimuthal modulation?
4.5. Is the azimuthal modulation aligned as we expect?
4.6. Closure phase statistics
4.7. Disk thickness
4.8. Luminosity-radius relation
4.9. Extended component
4.10. Inner gaseous disks

5. Summary and conclusions