# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.220673        0.00138985    
     0.460000          0.700000          0.247223        0.00122531    
     0.700000           1.00000          0.268708        0.00162625    
      1.00000           1.54000          0.283587        0.00145022    
      1.54000           2.40000          0.280156        0.00160747    
      2.40000           4.80000          0.260093        0.00191599    
      4.80000           10.0000          0.225616        0.00263207