Vehicle.cc

    _addFact(&_temperature2Fact,       _temperature2FactName);
    _addFact(&_temperature3Fact,       _temperature3FactName);

    // Start out as not available "--.--"
    _temperature1Fact.setRawValue      (std::numeric_limits<float>::quiet_NaN());
    _temperature2Fact.setRawValue      (std::numeric_limits<float>::quiet_NaN());
    _temperature3Fact.setRawValue      (std::numeric_limits<float>::quiet_NaN());
}