# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0874491        0.00202112    
     0.460000          0.700000         0.0771673        0.00170367    
     0.700000           1.00000         0.0716467        0.00194704    
      1.00000           1.54000         0.0571587        0.00200427    
      1.54000           2.40000         0.0473939        0.00239920    
      2.40000           4.80000         0.0385170        0.00288413    
      4.80000           10.0000         0.0316034        0.00406199