Year

Average Fiber Length (inches)

∑HU 890 ˚C (Early)

∑HU 1000 ˚C (Intermediate)

∑HU 1110 ˚C (Late)

1996

1.069 b

1.083 a

1.084 a

1997

1.073 a

1.080 a

1.076 a

1998

1.066 b

1.073 ab

1.077 a

1999

1.048 a

1.040 a

1.056 a

Average

1.064 b

1.069 ab

1.073 a