# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0606514        0.00601678    
     0.460000          0.700000         0.0694965        0.00625459    
     0.700000           1.00000         0.0731143        0.00906214    
      1.00000           1.54000          0.102176         0.0113303    
      1.54000           2.40000         0.0628055         0.0150502    
      2.40000           4.80000          0.278896         0.0190101    
      4.80000           10.0000          0.218027         0.0199517