BJR -- Gallacher et al. 76 (907): 464 Figure 1

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Figure 1. Comparison of the standard threshold detection index plots relating to 25 cm field of view versus detail diameter. ${triangleup}$ =F25, FAXIL Data (F25, 1992); x =STB1, STB/7/82 New Systems Data (DOH, 1982); +=STB2, STB/7/82 Systems of age 5 years (DOH, 1982).