# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0144746        0.00345340    
     0.460000          0.700000         0.0131083        0.00268682    
     0.700000           1.00000         0.0112138        0.00354705    
      1.00000           2.40000        0.00569702        0.00347510    
      2.40000           4.80000         0.0106529        0.00710028    
      4.80000           10.0000         0.0176821        0.00852858