null: 6.63, work: 7.41, delta: 0.77
null: 6.45, work: 7.60, delta: 1.14
null: 6.41, work: 7.36, delta: 0.95
null: 6.49, work: 7.25, delta: 0.77
null: 6.47, work: 7.41, delta: 0.93
null: 6.52, work: 7.37, delta: 0.85
null: 6.38, work: 7.30, delta: 0.93
null: 6.44, work: 7.22, delta: 0.78
null: 6.49, work: 7.38, delta: 0.89
null: 6.50, work: 7.29, delta: 0.79