# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.106530        0.00806818    
     0.460000          0.700000          0.126810        0.00756870    
     0.700000           1.00000          0.126032        0.00727887    
      1.00000           1.54000          0.121421        0.00843369    
      1.54000           2.40000          0.125593         0.0110268    
      2.40000           4.80000         0.0982223         0.0135867    
      4.80000           10.0000         0.0903778         0.0230828