# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.243999        0.00152979    
     0.460000          0.700000          0.254675        0.00156221    
     0.700000           1.00000          0.261275        0.00162277    
      1.00000           1.54000          0.277924        0.00194434    
      1.54000           2.40000          0.278740        0.00272888    
      2.40000           4.80000          0.245236        0.00402084    
      4.80000           10.0000          0.192795        0.00669371