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!!!!!  VERIFICATION CHECK: vc-forces-numerical-derivative  !!!!!
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Description: Comparison of the analytical forces obtained from the model with
             forces computed by numerical differentiation using Richardson
             extrapolation for a randomly distorted non-periodic structure based
             off the equilibrium face-centered cubic (fcc) structure. Separate
             configurations are tested for each species supported by the model,
             as well as one containing a random distribution of all species.
             Configurations used for testing are provided as auxiliary files.

Author: Ellad Tadmor

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Results for KIM Model      : Pair_Morse_Modified_MacDonaldMacDonald_Cu__MO_034823476734_000
Supported species          : Cu

random seed                = 13
perturbation amplitude     = 0.250
number unit cells per side = 2
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FAILED to get equilibrium constant for species =  Cu; skipping