Third slave (purple) 
trebles the area 
  
  
  
  
  
  
covered. = 
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fem o RELATIVE ACCURACY CONTOURS IN FEET (120^ CHAIN). The master /slave 
equal ET are generally about 80 miles long. The squares in this 
one-fifth the baseline lengths for estimation of distances and areas. The error figures are 
based on a standard deviation of 0.01 mean lanes. 
diagram and Figs. 4, 5 have sides 
  
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