Panel (C) shows the average values and 95% confidence intervals over 100 trials where model fitting improves precision over the CLS method by 8 × to 15 × for Kubo time constants and 8 × to 50 × for Kubo amplitudes and homogeneous dephasing. That true values fall within the intervals in (C) suggests the model fitting is highly accurate and reliable when provided an appropriate model for the data. On the other hand, the CLS method is inaccurate by 5-10% on average.