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FAR RANGE: 31
middle range : 32
middle close: 33
nearer: 34
over ur head: variable from 37-47 and higher
if the planes are at 3/4 of their height: 28
if the planes are at half height: 24-25
1/3rd height: 20
sea level: from 6(near) to 13(far)
as a general rule, minus 1 degree for far range,
for nearer range, add 1 or 2 degrees
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