Fig. 5.

Median deviations of observed minus smoothed PSA values. Each line corresponds to a smoothing scheme, a scheme being the combination of a smoothing method with a value for the DF. Median values above zero indicate that the smoothed value is under-estimating the trend or that there is a positive transient effect; median values below zero indicate the opposite. The dashed black envelope is 10% of the log-smoothed sPSA for six DF