1. INTRODUCTION

2. RIOTS4 TARGETS AND OBSERVATIONS

3. RIOTS4 DATA PRODUCTS
   3.1. Catalog of Spectral Types
   3.2. Stellar Radial Velocities and Multi-Epoch Observations

4. RESULTS
   4.1. Stellar Catalog
   4.2. Field IMF
   4.3. In Situ Formation of Field O Stars
   4.4. Radial Velocity Distribution
   4.5. Runaway Stars
   4.6. Binary Stars
   4.7. Emission-line stars

5. DISCUSSION

6. CONCLUSIONS