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. 1992 Mar-Apr;97(2):253–265. doi: 10.6028/jres.097.007

Table 1.

Measurement results with optical microscopy*

Vial# Sample # Sphere diameter (μm) # of measurements # of photographs
  1   1 2.975 1092 15
  1   2 2.972   571   9
  1   3 2.974   475 11
  1   4 2.975   501 17
  1 1 to 4 2.974 2639 52
  2   5 2.978   720 11
  3   6 2.975   214   4
  4   7 2.975 1061   9
all all 2.975 4634 76
a

Diameter distribution is approximately normal for 10 to 90%. Standard deviation over this interval: 0.021 μm.