# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0320426         0.0247921    
     0.460000          0.700000         0.0420954         0.0147378    
     0.700000           1.00000         0.0176692         0.0192876    
      1.00000           1.54000          0.107485        0.00632991    
      1.54000           2.40000          0.152830        0.00531542    
      2.40000           4.80000          0.135001        0.00328963    
      4.80000           10.0000          0.112139        0.00368056