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7- Flight altitudes ranging between 3000 ft. and 30000 ft. 
8. Map scales between 1:50000 and 1:1000000 are considered in the 
chart. 
It should be emphasized that the map scale referred to here is not 
necessarily that of the direct stereo-compilation; it could be reduced 
(photographically or otherwise) from the most favorable mapping scale 
that best suits the photo-scale and the stereoplotter. It must also be 
pointed out that interpolation may be used in all parameters of 
Figures 2, 2-a, 3 and 3-a. 
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