# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.490945        0.00485736    
     0.460000          0.700000          0.529101        0.00448557    
     0.700000           1.00000          0.584052        0.00594572    
      1.00000           1.54000          0.781709        0.00969040    
      1.54000           2.40000          0.761610         0.0152313    
      2.40000           4.80000          0.618752         0.0227746    
      4.80000           10.0000          0.465068         0.0464478