# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0479634        0.00629229    
     0.460000          0.700000         0.0342865        0.00959355    
     0.700000           1.00000         0.0952520         0.0114497    
      1.00000           1.54000          0.145663         0.0194965    
      1.54000           2.40000          0.165710         0.0291486    
      2.40000           10.0000          0.241239         0.0413144