Spherical model

1976

1991

2000

2005

2011

2015

Sill

0.0015

0.0012

0.0007

0.0011

0.0008

0.0010

Range (m)

700.5

766.5

799.9

1040.7

1099.1

1101

Root-mean-square (RMS)

0.031

0.008

0.017

0.017

0.028

0.023

Average standard error

0.002

0.056

0.016

0.060

0.063

0.054

Mean standardized

0.021

0.003

0.001

0.027

0.007

0.015

Root-mean-square-standardized

1.501

1.281

1.057

1.213

1.172

0.951