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var QcValueConverter = {
  tensionFromQcValue: function(qcValue) {
    return (qcValue - 30.0) * 3.62 + 194.0;
  },

  qcValueFromTension: function(tension) {
    return (tension - 194.0) / 3.62 + 30.0;
  },

  frictionFromQcValue: function(qcValue) {
    return (qcValue - 8.0) * 3.0 + 25.0;
  },

  qcValueFromFriction: function(friction) {
    return (friction - 25.0) / 3.0 + 8.0;
  }
};