src/h3lib/lib/faceijk.c [630:648]:
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    };

    // get the correct set of substrate vertices for this resolution
    CoordIJK *verts;
    if (isResolutionClassIII(*res))
        verts = vertsCIII;
    else
        verts = vertsCII;

    // adjust the center point to be in an aperture 33r substrate grid
    // these should be composed for speed
    _downAp3(&fijk->coord);
    _downAp3r(&fijk->coord);

    // if res is Class III we need to add a cw aperture 7 to get to
    // icosahedral Class II
    if (isResolutionClassIII(*res)) {
        _downAp7r(&fijk->coord);
        *res += 1;
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src/h3lib/lib/faceijk.c [807:825]:
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    };

    // get the correct set of substrate vertices for this resolution
    CoordIJK *verts;
    if (isResolutionClassIII(*res))
        verts = vertsCIII;
    else
        verts = vertsCII;

    // adjust the center point to be in an aperture 33r substrate grid
    // these should be composed for speed
    _downAp3(&fijk->coord);
    _downAp3r(&fijk->coord);

    // if res is Class III we need to add a cw aperture 7 to get to
    // icosahedral Class II
    if (isResolutionClassIII(*res)) {
        _downAp7r(&fijk->coord);
        *res += 1;
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