# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.142878        0.00159204    
     0.460000          0.700000          0.156770        0.00141364    
     0.700000           1.00000          0.178604        0.00168302    
      1.00000           1.54000          0.190184        0.00154707    
      1.54000           2.40000          0.183591        0.00176810    
      2.40000           4.80000          0.164854        0.00193761    
      4.80000           10.0000          0.142552        0.00290704