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Table 3. Standard error of unit weight (mm).
Picture
3
Root
mean
square
Degrees of
freedom
Aper
ture
Picture
1
Picture
2
f: 5. 6
0. 0049
0. 0056
f : 8
0. 0051
0. 0054
f : 11
0. 0060
0. 0052
f: 16
0.0028
0.0033
Root
mean
square
0. 0046
0.0050
359
0.0048
0. 0051
359
0.0061
0.0058
3 59
0.0036
0.0032
353
0.0049
1430