# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.114460        0.00531930    
     0.460000          0.700000          0.113767        0.00531370    
     0.700000           1.00000          0.119076        0.00648515    
      1.00000           1.54000          0.109313        0.00642422    
      1.54000           2.40000          0.104647        0.00849016    
      2.40000           4.80000          0.111238         0.0110931    
      4.80000           10.0000         0.0863517         0.0186356