{
    "description"   "Calculates the surface energy of several high symmetry surfaces and produces a broken bond model fit. In latex form, the fit equations are given by:

E_{FCC} (\\vec{n}) = p_1 (4 \\left( |x+y| + |x-y| + |x+z| + |x-z| + |z+y| +|z-y|\\right)) + p_2 (8 \\left( |x| + |y| + |z|\\right))  + p_3 (2 ( |x+ 2y + z| + |x+2y-z| + |x-2y + z| + |x-2y-z| + |2x+y+z| + |2x+y-z| +|2x-y+z| +|2x-y-z| +|x+y+2z| +|x+y-2z| +|x-y+2z| +|x-y-2z| ) + c

E_{BCC} (\\vec{n}) = p_1 (6 \\left( | x+y+z| + |x+y-z| + |-x+y-z| + |x-y+z| \\right)) + p_2 (8 \\left( |x| + |y| + |z|\\right)) + p_3 (4 \\left( |x+y| + |x-y| + |x+z| + |x-z| + |z+y| +|z-y|\\right)) +c.  

In Python form, these two fits take the form:
def BrokenBondFCC(params, index):

    import numpy
    x, y, z = index
    x = x / numpy.sqrt(x**2.+y**2.+z**2.)
    y = y / numpy.sqrt(x**2.+y**2.+z**2.)
    z = z / numpy.sqrt(x**2.+y**2.+z**2.)

    return params[0]*4* (abs(x+y) + abs(x-y) + abs(x+z) + abs(x-z) + abs(z+y) + abs(z-y)) + params[1]*8*(abs(x) + abs(y) + abs(z)) + params[2]*(abs(x+2*y+z) + abs(x+2*y-z) +abs(x-2*y+z) +abs(x-2*y-z) + abs(2*x+y+z) +abs(2*x+y-z) +abs(2*x-y+z) +abs(2*x-y-z) + abs(x+y+2*z) +abs(x+y-2*z) +abs(x-y+2*z) +abs(x-y-2*z))+params[3]

def BrokenBondBCC(params, x, y, z):\n

    import numpy
    x, y, z = index
    x = x / numpy.sqrt(x**2.+y**2.+z**2.)
    y = y / numpy.sqrt(x**2.+y**2.+z**2.)
    z = z / numpy.sqrt(x**2.+y**2.+z**2.)

    return params[0]*6*(abs(x+y+z) + abs(x-y-z) + abs(x-y+z) + abs(x+y-z)) + params[1]*8*(abs(x) + abs(y) + abs(z)) + params[2]*4* (abs(x+y) + abs(x-y) + abs(x+z) + abs(x-z) + abs(z+y) + abs(z-y)) + params[3]"


    "domain"        "openkim.org"
    "extended-id"   "SurfaceTest__TD_955413365818_001"
    "title"         "SurfaceTest"
    "kim-api-version" "1.6"
    "pipeline-api-version" "1.0"
    "properties"    ["tag:staff@noreply.openkim.org,2014-05-21:property/surface-energy-broken-bond-fit-cubic-bravais-crystal-npt" "tag:staff@noreply.openkim.org,2014-05-21:property/surface-energy-cubic-crystal-npt" "tag:staff@noreply.openkim.org,2014-05-21:property/surface-energy-ideal-cubic-crystal"]
    "executables"   ["runner" "test_template/runner"]
    "creator" "Matt Bierbaum"
    "contributor-id" "8f8225b4-8b9c-439d-879d-45ee35db5757"
    "maintainer-id" "8f8225b4-8b9c-439d-879d-45ee35db5757"
    "publication-year" "2014"
}