# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.117243        0.00366472    
     0.460000          0.700000          0.121721        0.00368965    
     0.700000           1.00000          0.133276        0.00451247    
      1.00000           1.54000          0.149633        0.00481754    
      1.54000           2.40000          0.152084        0.00593737    
      2.40000           4.80000          0.149695        0.00687109    
      4.80000           10.0000          0.145968         0.0100871