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Fig. 5C —Mean attenuation in relation to tube current at 15th
percentile of attenuation. 
with solid line indicate mean attenuation of
–650 H; with dashed line, attenuation of –650 H at 15th
percentile; 
with solid line, mean attenuation of –820 H;
with dashed line, attenuation of –820 H at 15th percentile; 
with
solid line, mean attenuation of –1,000 H; with dashed line,
attenuation of –1,000 H at 15th percentile. Graph shows mean and 15th
percentile of attenuation at apex of lung. 15th percentile of attenuation
changes more with decreasing tube current than with mean attenuation.
