Keywords: High-redshift galaxies (734); Lyman-alpha galaxies (978); Galaxy properties (615)

1. INTRODUCTION

2. TARGET SELECTION AND SPECTROSCOPIC OBSERVATIONS

2.1. The Magellan M2FS Survey

2.2. Candidate Selection

2.3. Spectroscopic Observations

2.4. Data Reduction

3. A SAMPLE OF 260 LAES AT $Z\approx5.7$

4. LY α SPECTRAL PROPERTIES

5. DISCUSSION

6. SUMMARY
```