code: function _computeReflectionCoefficients(absorptionCoefficients) {
    let reflectionCoefficients = [];
    for (let property in Utils.DEFAULT_REFLECTION_COEFFICIENTS) {
      if (Utils.DEFAULT_REFLECTION_COEFFICIENTS
          .hasOwnProperty(property)) {
        // Compute average absorption coefficient (per wall).
        reflectionCoefficients[property] = 0;
        for (let j = 0; j < Utils.NUMBER_REFLECTION_AVERAGING_BANDS; j++) {
          let bandIndex = j + Utils.ROOM_STARTING_AVERAGING_BAND;
          reflectionCoefficients[property] +=
            absorptionCoefficients[property][bandIndex];
        }
        reflectionCoefficients[property] /=
          Utils.NUMBER_REFLECTION_AVERAGING_BANDS;
  
        // Convert absorption coefficient to reflection coefficient.
        reflectionCoefficients[property] =
          Math.sqrt(1 - reflectionCoefficients[property]);
      }
    }
    return reflectionCoefficients;
  }
docs: Compute reflection coefficients from absorption coefficients.
  @param {Object} absorptionCoefficients
  @return {Object}