R Under development (unstable) (2019-04-06 r76327) -- "Unsuffered Consequences"
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>  # fields is a package for analysis of spatial data written for
>   # the R software environment .
>   # Copyright (C) 2018
>   # University Corporation for Atmospheric Research (UCAR)
>   # Contact: Douglas Nychka, nychka@ucar.edu,
>   # National Center for Atmospheric Research,
>   # PO Box 3000, Boulder, CO 80307-3000
>   #
>   # This program is free software; you can redistribute it and/or modify
>   # it under the terms of the GNU General Public License as published by
>   # the Free Software Foundation; either version 2 of the License, or
>   # (at your option) any later version.
>   # This program is distributed in the hope that it will be useful,
>   # but WITHOUT ANY WARRANTY; without even the implied warranty of
>   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>   # GNU General Public License for more details.
> 
> 
> 
> ############################################################################
> #      Begin tests of Matern covaraince parameter estimate
> # Note that in all tests the smoothness (nu) is fixed
> # and only theta (range), sill ( rho) and nugget (sigma2) are considered. 
> ##########################################################################
> suppressMessages(library(fields))
> 
> options( echo=FALSE)
[1] 75 75
[1] 75 75
Testing:  sanity check 1 for REML from Krig
PASSED test at tolerance  2e-04
Testing:  sanity check 2 for REML from Krig
PASSED test at tolerance  1e-08
Testing:  check REML rho
PASSED test at tolerance  0.001
Testing:  check REML theta
PASSED test at tolerance  0.001
Testing:   check REML sigma2
PASSED test at tolerance  2e-04
Testing:  Profile likelihoods from Krig and optim
PASSED test at tolerance  1e-08
Testing:  Profile likelihoods from Krig and golden search
PASSED test at tolerance  1e-08
done with Matern REML estimator tests where smoothness is fixed
> 
> proc.time()
   user  system elapsed 
  2.334   0.231   2.542