Illustration of several of the filtering algorithms. (a) The SWPP BA shows examples of the ‘identical run’ and ‘anomalous region’ algorithms. (b) The NSB BA demonstrates the ‘double-sided delta’ algorithm and a few falsely screened ‘identical run’ hours. (c) The SOCO BA demonstrates the ‘double-sided delta’ and ‘anomalous region’ filters. (d) The SCL BA demonstrates multiple screening algorithms with emphasis placed on the ‘single-sided delta’ filter and the ‘local demand’ filter.