# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0564963        0.00661183    
     0.460000          0.700000         0.0497557        0.00787850    
     0.700000           1.00000         0.0540184         0.0100160    
      1.00000           1.54000         0.0577450         0.0109955    
      1.54000           2.40000         0.0470341         0.0152836    
      2.40000           10.0000         0.0447085         0.0251215