1. INTRODUCTION  
2. OBSERVATIONS  
2.1. Sample selection  
2.2. Observations  
2.3. Data reduction  
3. ANALYSIS  
3.1. Detected binaries  
3.2. Binary fractions  
3.3. Monte Carlo Simulations  
4. DISCUSSION  
4.1. Selection effects and biases  
4.2. Physical effects  
4.3. The low wide binary fraction is real  
5. CONCLUSIONS