(a) The residues of extreme points of the four tilt angles due to the adjustment rounds. The residues were obtained by subtracting the offset values (the extreme points of round 8) from the extreme points of each round. The black symbols and bars indicate the experimental data, and the red symbols indicate the theoretical values (see Table 1). The inset figure shows an enlarged view of the last three adjustment rounds. (b) The measured g-values due to the adjustment rounds. The g-values have been subtracted by the Earth tide and the g-value of round 8. The inset figure shows an enlarged view of the last three adjustment rounds.