# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.237455        0.00689857    
     0.460000          0.700000          0.247781        0.00678952    
     0.700000           1.00000          0.300544        0.00946958    
      1.00000           1.54000          0.425002         0.0205248    
      1.54000           2.40000          0.510139         0.0308856    
      2.40000           4.80000          0.511522         0.0453170    
      4.80000           10.0000          0.112403          0.180479