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  function d3_ease_cubic(t) {

    return t * t * t;

  }

  function d3_ease_cubicInOut(t) {

    if (t <= 0) return 0;

    if (t >= 1) return 1;

    var t2 = t * t, t3 = t2 * t;

    return 4 * (t < .5 ? t3 : 3 * (t - t2) + t3 - .75);

  }

  function d3_ease_poly(e) {

    return function(t) {

      return Math.pow(t, e);

      }

    };

  }

  function d3_geo_clipAntimeridianIntersect(λ0, φ0, λ1, φ1) {

    var cosφ0, cosφ1, sinλ0_λ1 = Math.sin(λ0 - λ1);

    return abs(sinλ0_λ1) > ε ? Math.atan((Math.sin(φ0) * (cosφ1 = Math.cos(φ1)) * Math.sin(λ1) - Math.sin(φ1) * (cosφ0 = Math.cos(φ0)) * Math.sin(λ0)) / (cosφ0 * cosφ1 * sinλ0_λ1)) : (φ0 + φ1) / 2;

  }

  function d3_geo_clipAntimeridianInterpolate(from, to, direction, listener) {

    var φ;

    if (from == null) {

      return t * t * ((s + 1) * t - s);

    };

  }

  function d3_ease_bounce(t) {

    return t < 1 / 2.75 ? 7.5625 * t * t : t < 2 / 2.75 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75 : t < 2.5 / 2.75 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375 : 7.5625 * (t -= 2.625 / 2.75) * t + .984375;

  }

  d3.interpolateHcl = d3_interpolateHcl;

  function d3_interpolateHcl(a, b) {

    a = d3.hcl(a);