BAM daily First-Look analysis. The BAM data quality is monitored on a daily basis using several metrics implemented in the First-Look system. The top panel shows the evolution of the fringe phase for the preceding field of view during four spacecraft revolutions beginning on 2015-12-15. The significant (≈1 mas) amplitude of the periodic variations is apparent. The bottom panel shows the evolution of a secondary (nuisance) parameter, namely the average fringe period, during the same interval (≈1 ppm variability in this case). The plots include average values computed by First Look but have been adapted for better visualisation.