# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0237912        0.00329798    
     0.460000          0.700000         0.0320550        0.00276440    
     0.700000           1.00000         0.0295073        0.00299295    
      1.00000           1.54000         0.0281447        0.00311330    
      1.54000           2.40000         0.0227299        0.00422314    
      2.40000           10.0000         0.0144732        0.00508799