# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.155732        0.00869927    
     0.460000          0.700000          0.166141        0.00898600    
     0.700000           1.00000          0.173935         0.0112655    
      1.00000           1.54000          0.292574         0.0206208    
      1.54000           2.40000          0.297587         0.0301267    
      2.40000           10.0000          0.329040         0.0456929