0 20 40 60 80 100 120 0 20 40 60 80 Time Residue parent SFO FOCUS_C χ 2 error level = 15.8% 0 20 40 60 80 100 120 -10 -5 0 5 10 Time Residual FOCUS_C residuals 0 20 40 60 0 20 40 60 80 100 Time Residue SFO FOCUS_D χ 2 error level = 6.45% 0 20 40 60 80 -10 -5 0 5 10 Time Residual FOCUS_D residuals