class arf{
private:
vector<Real> m_LowEnergy; // Start energy of bin
vector<Real> m_HighEnergy; // End energy of bin
vector<Real> m_EffArea; // Effective areas
string m_EnergyUnits; // Units for energies
string m_arfUnits; // Units for effective areas
string m_Telescope;
string m_Instrument;
string m_Detector;
string m_Filter;
string m_ExtensionName; // EXTNAME keyword in SPECRESP extension