# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.377688        0.00410890    
     0.460000          0.700000          0.391275        0.00384743    
     0.700000           1.00000          0.397252        0.00484816    
      1.00000           1.54000          0.462491        0.00676642    
      1.54000           2.40000          0.465015         0.0110581    
      2.40000           4.80000          0.428688         0.0164792    
      4.80000           10.0000          0.446489         0.0322897