1 INTRODUCTION
2 THE SURVEY DATA
2.1 Observations
2.2 Data reduction
2.3 Data quality
2.4 Public data release
3 GLOBAL DISTRIBUTION OF MOLECULAR GAS
3.1 Integrated emission
3.2 Longitude-velocity distribution
3.3 Correlation between molecular gas and spiral arms
4 NOTEWORTHY REGIONS
4.1 Galactic Centre
4.2 Bania molecular clouds
4.3 Population of nearby wispy clouds
5 OTHER MOLECULAR TRANSITIONS
6 PERSPECTIVES AND CONCLUSIONS