# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.132461        0.00207417    
     0.460000          0.700000          0.144389        0.00186313    
     0.700000           1.00000          0.172963        0.00273582    
      1.00000           1.54000          0.166329        0.00233061    
      1.54000           2.40000          0.150680        0.00261558    
      2.40000           4.80000          0.125500        0.00269906    
      4.80000           10.0000          0.106911        0.00364744