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PR curves of different comparison algorithms on aircraft target data set (A: FRCN-ZF; B: FRCN-VGG; C: SSD; D: YOLO-v5; E: YOLO v1; F: YOLO-v5+ R-FCN; a: Berlin Brandenburg Airport Willy Brandt; b: Sydney Kingsford Smith Airport; c: Tokyo International Airport; d: John F. Kennedy International Airport; e: Toronto Pearson International Airport).
