# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.158014        0.00262689    
     0.460000          0.700000          0.171097        0.00236474    
     0.700000           1.00000          0.195064        0.00317426    
      1.00000           1.54000          0.199173        0.00274340    
      1.54000           2.40000          0.173803        0.00299842    
      2.40000           4.80000          0.139232        0.00310159    
      4.80000           10.0000          0.113533        0.00451628