# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0225546         0.0191934    
     0.700000           1.00000         0.0352434         0.0137132    
      1.00000           1.54000         0.0105317        0.00534821    
      1.54000           2.40000         0.0174750        0.00233254    
      2.40000           4.80000         0.0234697        0.00165632    
      4.80000           10.0000         0.0177221        0.00253385